{"id":1065,"date":"2026-03-05T10:37:42","date_gmt":"2026-03-05T10:37:42","guid":{"rendered":"https:\/\/www.merckvaccines.com\/enflonsia\/?page_id=1065"},"modified":"2026-03-23T09:02:24","modified_gmt":"2026-03-23T09:02:24","slug":"clinical-studies","status":"publish","type":"page","link":"https:\/\/www.merckvaccines.com\/enflonsia\/clinical-studies\/","title":{"rendered":"Clinical studies"},"content":{"rendered":"<link rel='stylesheet' id='vivid360-hero-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/hero\/css\/style.min.css?ver=1765194012' media='all' \/>\n\n<div id=\"\" class=\"wp-block-vivid360-hero\"><div class=\"vivid360-hero-container align-left align-top ratio-50-50 horizontal desktop text-align-left has-primary-color is-overlay-style is-card-overlay is-white-overlay mobile-is-split-style mobile-split-image-bottom mobile-uses-custom-styles\" style=\"border-width:0;border-style:solid;border-top-left-radius:0;border-top-right-radius:0;border-bottom-right-radius:0;border-bottom-left-radius:0;--minHeight:253px;--mobileMinHeight:288px\"><div class=\"wide_screens hidden\" data-value=\"default\"><\/div><picture><source media=\"(max-width: 767px)\" srcset=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Mobile_Clinical-Data_RGB.jpg?w=767\"\/><source media=\"(min-width: 768px) and (max-width:1024px)\" srcset=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Desktop_Clinical-Data_RGB.jpg?w=1024\"\/><source media=\"(min-width: 1025px) and (max-width:1440px)\" srcset=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Desktop_Clinical-Data_RGB.jpg?w=1440\"\/><img decoding=\"async\" width=\"4512\" height=\"1012\" loading=\"lazy\" data-src=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Desktop_Clinical-Data_RGB.jpg?w=1488\" src=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Desktop_Clinical-Data_RGB.jpg?w=1488\" alt=\"\" class=\"hero-image\" style=\"--desktop-focal-x:89%;--desktop-focal-y:50%;--mobile-focal-x:50%;--mobile-focal-y:50%;--tablet-focal-x:89%;--tablet-focal-y:50%\"\/><\/picture><div class=\"hero-wrapper\"><div class=\"hero-content\"><h1 style=\"--headlineFontSize:36px;--headlineFontSizeTablet:36px;--headlineFontSizeMobile:24px;--headlineLineHeight:45px;--headlineLineHeightTablet:45px;--headlineLineHeightMobile:30px\" class=\"hero-title fontWeightBold\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-primary-color\"><strong><strong><strong>Clinical data for ENFLONSIA<sup>TM <\/sup><span class=\"no-wrap-text\">(clesrovimab-cfor)<\/span><\/strong><\/strong><\/strong><\/mark><\/h1><p style=\"--contentFontSize:18px;--contentLineHeight:27px;--contentFontSizeMobile:18px;--contentLineHeightMobile:27px\" class=\"hero-description\"><\/p><div class=\"hero-btn-group\"><\/div><div class=\"hero-caption\"><\/div><\/div><\/div><\/div><div class=\"hero-caption-2desktop\"><\/div><\/div>\n\n\n<link rel='stylesheet' id='vivid360-spacer-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/spacer\/css\/style.min.css?ver=1765194012' media='all' \/>\n\n<div style=\"background-color:transparent;--desktop-spacer:32px;--mobile-spacer:32px;--tablet-spacer:32px\" class=\"wp-block-vivid360-spacer vivid360-spacer-desktop vivid360-spacer-mobile vivid360-spacer-tablet\"><\/div>\n\n\n<style>.vivid360-content-switcher-titles button.has-primary-border { border : 2px solid #024a33 !important; color: #024a33; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-primary-border.open { background: #024a33 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-primary-border.open:hover { background: #024a33 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-primary-border:not(open) { color: #024a33 !important; }.vivid360-content-switcher-titles button.has-primary-border:not(open):hover { background: #024a33 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-primary-border:not(open):active { background: #024a33 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-primary-border:not(open):focus { background: #024a33 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-primary-border::selection {display: none; }.vivid360-content-switcher-titles button.has-primary-border:last-of-type { border-right: 2px solid #024a33 !important; }.vivid360-content-switcher-titles button.has-primary dark-border { border : 2px solid #024a33 !important; color: #024a33; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-primary dark-border.open { background: #024a33 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-primary dark-border.open:hover { background: #024a33 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-primary dark-border:not(open) { color: #024a33 !important; }.vivid360-content-switcher-titles button.has-primary dark-border:not(open):hover { background: #024a33 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-primary dark-border:not(open):active { background: #024a33 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-primary dark-border:not(open):focus { background: #024a33 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-primary dark-border::selection {display: none; }.vivid360-content-switcher-titles button.has-primary dark-border:last-of-type { border-right: 2px solid #024a33 !important; }.vivid360-content-switcher-titles button.has-primary light-border { border : 2px solid #00a370 !important; color: #00a370; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-primary light-border.open { background: #00a370 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-primary light-border.open:hover { background: #00a370 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-primary light-border:not(open) { color: #00a370 !important; }.vivid360-content-switcher-titles button.has-primary light-border:not(open):hover { background: #00a370 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-primary light-border:not(open):active { background: #00a370 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-primary light-border:not(open):focus { background: #00a370 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-primary light-border::selection {display: none; }.vivid360-content-switcher-titles button.has-primary light-border:last-of-type { border-right: 2px solid #00a370 !important; }.vivid360-content-switcher-titles button.has-primary alternate color-border { border : 2px solid #006b49 !important; color: #006b49; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-primary alternate color-border.open { background: #006b49 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-primary alternate color-border.open:hover { background: #006b49 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-primary alternate color-border:not(open) { color: #006b49 !important; }.vivid360-content-switcher-titles button.has-primary alternate color-border:not(open):hover { background: #006b49 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-primary alternate color-border:not(open):active { background: #006b49 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-primary alternate color-border:not(open):focus { background: #006b49 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-primary alternate color-border::selection {display: none; }.vivid360-content-switcher-titles button.has-primary alternate color-border:last-of-type { border-right: 2px solid #006b49 !important; }.vivid360-content-switcher-titles button.has-primary alternate color dark-border { border : 2px solid #006b49 !important; color: #006b49; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-primary alternate color dark-border.open { background: #006b49 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-primary alternate color dark-border.open:hover { background: #006b49 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-primary alternate color dark-border:not(open) { color: #006b49 !important; }.vivid360-content-switcher-titles button.has-primary alternate color dark-border:not(open):hover { background: #006b49 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-primary alternate color dark-border:not(open):active { background: #006b49 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-primary alternate color dark-border:not(open):focus { background: #006b49 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-primary alternate color dark-border::selection {display: none; }.vivid360-content-switcher-titles button.has-primary alternate color dark-border:last-of-type { border-right: 2px solid #006b49 !important; }.vivid360-content-switcher-titles button.has-primary alternate color light-border { border : 2px solid #d3e9f0 !important; color: #d3e9f0; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-primary alternate color light-border.open { background: #d3e9f0 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-primary alternate color light-border.open:hover { background: #d3e9f0 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-primary alternate color light-border:not(open) { color: #d3e9f0 !important; }.vivid360-content-switcher-titles button.has-primary alternate color light-border:not(open):hover { background: #d3e9f0 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-primary alternate color light-border:not(open):active { background: #d3e9f0 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-primary alternate color light-border:not(open):focus { background: #d3e9f0 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-primary alternate color light-border::selection {display: none; }.vivid360-content-switcher-titles button.has-primary alternate color light-border:last-of-type { border-right: 2px solid #d3e9f0 !important; }.vivid360-content-switcher-titles button.has-secondary 1-border { border : 2px solid #0c2340 !important; color: #0c2340; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-secondary 1-border.open { background: #0c2340 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-secondary 1-border.open:hover { background: #0c2340 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-secondary 1-border:not(open) { color: #0c2340 !important; }.vivid360-content-switcher-titles button.has-secondary 1-border:not(open):hover { background: #0c2340 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-secondary 1-border:not(open):active { background: #0c2340 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-secondary 1-border:not(open):focus { background: #0c2340 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-secondary 1-border::selection {display: none; }.vivid360-content-switcher-titles button.has-secondary 1-border:last-of-type { border-right: 2px solid #0c2340 !important; }.vivid360-content-switcher-titles button.has-secondary 2-border { border : 2px solid #fff6e0 !important; color: #fff6e0; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-secondary 2-border.open { background: #fff6e0 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-secondary 2-border.open:hover { background: #fff6e0 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-secondary 2-border:not(open) { color: #fff6e0 !important; }.vivid360-content-switcher-titles button.has-secondary 2-border:not(open):hover { background: #fff6e0 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-secondary 2-border:not(open):active { background: #fff6e0 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-secondary 2-border:not(open):focus { background: #fff6e0 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-secondary 2-border::selection {display: none; }.vivid360-content-switcher-titles button.has-secondary 2-border:last-of-type { border-right: 2px solid #fff6e0 !important; }.vivid360-content-switcher-titles button.has-secondary 3-border { border : 2px solid #f7f7f7 !important; color: #f7f7f7; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-secondary 3-border.open { background: #f7f7f7 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-secondary 3-border.open:hover { background: #f7f7f7 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-secondary 3-border:not(open) { color: #f7f7f7 !important; }.vivid360-content-switcher-titles button.has-secondary 3-border:not(open):hover { background: #f7f7f7 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-secondary 3-border:not(open):active { background: #f7f7f7 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-secondary 3-border:not(open):focus { background: #f7f7f7 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-secondary 3-border::selection {display: none; }.vivid360-content-switcher-titles button.has-secondary 3-border:last-of-type { border-right: 2px solid #f7f7f7 !important; }.vivid360-content-switcher-titles button.has-black-border { border : 2px solid #000 !important; color: #000; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-black-border.open { background: #000 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-black-border.open:hover { background: #000 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-black-border:not(open) { color: #000 !important; }.vivid360-content-switcher-titles button.has-black-border:not(open):hover { background: #000 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-black-border:not(open):active { background: #000 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-black-border:not(open):focus { background: #000 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-black-border::selection {display: none; }.vivid360-content-switcher-titles button.has-black-border:last-of-type { border-right: 2px solid #000 !important; }.vivid360-content-switcher-titles button.has-dark gray-border { border : 2px solid #555 !important; color: #555; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-dark gray-border.open { background: #555 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-dark gray-border.open:hover { background: #555 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-dark gray-border:not(open) { color: #555 !important; }.vivid360-content-switcher-titles button.has-dark gray-border:not(open):hover { background: #555 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-dark gray-border:not(open):active { background: #555 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-dark gray-border:not(open):focus { background: #555 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-dark gray-border::selection {display: none; }.vivid360-content-switcher-titles button.has-dark gray-border:last-of-type { border-right: 2px solid #555 !important; }.vivid360-content-switcher-titles button.has-medium gray-border { border : 2px solid #a4a4a4 !important; color: #a4a4a4; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-medium gray-border.open { background: #a4a4a4 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-medium gray-border.open:hover { background: #a4a4a4 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-medium gray-border:not(open) { color: #a4a4a4 !important; }.vivid360-content-switcher-titles button.has-medium gray-border:not(open):hover { background: #a4a4a4 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-medium gray-border:not(open):active { background: #a4a4a4 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-medium gray-border:not(open):focus { background: #a4a4a4 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-medium gray-border::selection {display: none; }.vivid360-content-switcher-titles button.has-medium gray-border:last-of-type { border-right: 2px solid #a4a4a4 !important; }.vivid360-content-switcher-titles button.has-light gray-border { border : 2px solid #e4e4e4 !important; color: #e4e4e4; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-light gray-border.open { background: #e4e4e4 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-light gray-border.open:hover { background: #e4e4e4 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-light gray-border:not(open) { color: #e4e4e4 !important; }.vivid360-content-switcher-titles button.has-light gray-border:not(open):hover { background: #e4e4e4 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-light gray-border:not(open):active { background: #e4e4e4 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-light gray-border:not(open):focus { background: #e4e4e4 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-light gray-border::selection {display: none; }.vivid360-content-switcher-titles button.has-light gray-border:last-of-type { border-right: 2px solid #e4e4e4 !important; }.vivid360-content-switcher-titles button.has-ultralight gray-border { border : 2px solid #f4f4f4 !important; color: #f4f4f4; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-ultralight gray-border.open { background: #f4f4f4 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-ultralight gray-border.open:hover { background: #f4f4f4 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-ultralight gray-border:not(open) { color: #f4f4f4 !important; }.vivid360-content-switcher-titles button.has-ultralight gray-border:not(open):hover { background: #f4f4f4 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-ultralight gray-border:not(open):active { background: #f4f4f4 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-ultralight gray-border:not(open):focus { background: #f4f4f4 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-ultralight gray-border::selection {display: none; }.vivid360-content-switcher-titles button.has-ultralight gray-border:last-of-type { border-right: 2px solid #f4f4f4 !important; }.vivid360-content-switcher-titles button.has-white-border { border : 2px solid #FFF !important; color: #FFF; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-white-border.open { background: #FFF !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-white-border.open:hover { background: #FFF !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-white-border:not(open) { color: #FFF !important; }.vivid360-content-switcher-titles button.has-white-border:not(open):hover { background: #FFF !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-white-border:not(open):active { background: #FFF !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-white-border:not(open):focus { background: #FFF !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-white-border::selection {display: none; }.vivid360-content-switcher-titles button.has-white-border:last-of-type { border-right: 2px solid #FFF !important; }.vivid360-content-switcher-titles button.has-dark text-border { border : 2px solid #333333 !important; color: #333333; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-dark text-border.open { background: #333333 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-dark text-border.open:hover { background: #333333 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-dark text-border:not(open) { color: #333333 !important; }.vivid360-content-switcher-titles button.has-dark text-border:not(open):hover { background: #333333 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-dark text-border:not(open):active { background: #333333 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-dark text-border:not(open):focus { background: #333333 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-dark text-border::selection {display: none; }.vivid360-content-switcher-titles button.has-dark text-border:last-of-type { border-right: 2px solid #333333 !important; }.vivid360-content-switcher-titles button.has-light text-border { border : 2px solid #757575 !important; color: #757575; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-light text-border.open { background: #757575 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-light text-border.open:hover { background: #757575 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-light text-border:not(open) { color: #757575 !important; }.vivid360-content-switcher-titles button.has-light text-border:not(open):hover { background: #757575 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-light text-border:not(open):active { background: #757575 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-light text-border:not(open):focus { background: #757575 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-light text-border::selection {display: none; }.vivid360-content-switcher-titles button.has-light text-border:last-of-type { border-right: 2px solid #757575 !important; }.vivid360-content-switcher-titles button.has-success system-border { border : 2px solid #008a00 !important; color: #008a00; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-success system-border.open { background: #008a00 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-success system-border.open:hover { background: #008a00 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-success system-border:not(open) { color: #008a00 !important; }.vivid360-content-switcher-titles button.has-success system-border:not(open):hover { background: #008a00 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-success system-border:not(open):active { background: #008a00 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-success system-border:not(open):focus { background: #008a00 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-success system-border::selection {display: none; }.vivid360-content-switcher-titles button.has-success system-border:last-of-type { border-right: 2px solid #008a00 !important; }.vivid360-content-switcher-titles button.has-error system-border { border : 2px solid #db281a !important; color: #db281a; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-error system-border.open { background: #db281a !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-error system-border.open:hover { background: #db281a !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-error system-border:not(open) { color: #db281a !important; }.vivid360-content-switcher-titles button.has-error system-border:not(open):hover { background: #db281a !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-error system-border:not(open):active { background: #db281a !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-error system-border:not(open):focus { background: #db281a !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-error system-border::selection {display: none; }.vivid360-content-switcher-titles button.has-error system-border:last-of-type { border-right: 2px solid #db281a !important; }.vivid360-content-switcher-titles button.has-alert system-border { border : 2px solid #ffab00 !important; color: #ffab00; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-alert system-border.open { background: #ffab00 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-alert system-border.open:hover { background: #ffab00 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-alert system-border:not(open) { color: #ffab00 !important; }.vivid360-content-switcher-titles button.has-alert system-border:not(open):hover { background: #ffab00 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-alert system-border:not(open):active { background: #ffab00 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-alert system-border:not(open):focus { background: #ffab00 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-alert system-border::selection {display: none; }.vivid360-content-switcher-titles button.has-alert system-border:last-of-type { border-right: 2px solid #ffab00 !important; }.vivid360-content-switcher-titles button.has-neutral system-border { border : 2px solid #5450e4 !important; color: #5450e4; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-neutral system-border.open { background: #5450e4 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-neutral system-border.open:hover { background: #5450e4 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-neutral system-border:not(open) { color: #5450e4 !important; }.vivid360-content-switcher-titles button.has-neutral system-border:not(open):hover { background: #5450e4 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-neutral system-border:not(open):active { background: #5450e4 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-neutral system-border:not(open):focus { background: #5450e4 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-neutral system-border::selection {display: none; }.vivid360-content-switcher-titles button.has-neutral system-border:last-of-type { border-right: 2px solid #5450e4 !important; }.vivid360-content-switcher-titles button.has-success system (light background)-border { border : 2px solid #e5f4e5 !important; color: #e5f4e5; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-success system (light background)-border.open { background: #e5f4e5 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-success system (light background)-border.open:hover { background: #e5f4e5 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-success system (light background)-border:not(open) { color: #e5f4e5 !important; }.vivid360-content-switcher-titles button.has-success system (light background)-border:not(open):hover { background: #e5f4e5 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-success system (light background)-border:not(open):active { background: #e5f4e5 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-success system (light background)-border:not(open):focus { background: #e5f4e5 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-success system (light background)-border::selection {display: none; }.vivid360-content-switcher-titles button.has-success system (light background)-border:last-of-type { border-right: 2px solid #e5f4e5 !important; }.vivid360-content-switcher-titles button.has-error system (light background)-border { border : 2px solid #ffe7e6 !important; color: #ffe7e6; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-error system (light background)-border.open { background: #ffe7e6 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-error system (light background)-border.open:hover { background: #ffe7e6 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-error system (light background)-border:not(open) { color: #ffe7e6 !important; }.vivid360-content-switcher-titles button.has-error system (light background)-border:not(open):hover { background: #ffe7e6 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-error system (light background)-border:not(open):active { background: #ffe7e6 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-error system (light background)-border:not(open):focus { background: #ffe7e6 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-error system (light background)-border::selection {display: none; }.vivid360-content-switcher-titles button.has-error system (light background)-border:last-of-type { border-right: 2px solid #ffe7e6 !important; }.vivid360-content-switcher-titles button.has-alert system (light background)-border { border : 2px solid #fff5c6 !important; color: #fff5c6; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-alert system (light background)-border.open { background: #fff5c6 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-alert system (light background)-border.open:hover { background: #fff5c6 !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-alert system (light background)-border:not(open) { color: #fff5c6 !important; }.vivid360-content-switcher-titles button.has-alert system (light background)-border:not(open):hover { background: #fff5c6 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-alert system (light background)-border:not(open):active { background: #fff5c6 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-alert system (light background)-border:not(open):focus { background: #fff5c6 !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-alert system (light background)-border::selection {display: none; }.vivid360-content-switcher-titles button.has-alert system (light background)-border:last-of-type { border-right: 2px solid #fff5c6 !important; }.vivid360-content-switcher-titles button.has-neutral system (light background)-border { border : 2px solid #ededfc !important; color: #ededfc; border-right: none !important; outline: none !important; text-transform: uppercase; }.vivid360-content-switcher-titles button.has-neutral system (light background)-border.open { background: #ededfc !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-neutral system (light background)-border.open:hover { background: #ededfc !important; color: #fff !important; }.vivid360-content-switcher-titles button.has-neutral system (light background)-border:not(open) { color: #ededfc !important; }.vivid360-content-switcher-titles button.has-neutral system (light background)-border:not(open):hover { background: #ededfc !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(0,0,0,0.2); border: none !important; padding: 0 22px; }.vivid360-content-switcher-titles button.has-neutral system (light background)-border:not(open):active { background: #ededfc !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-neutral system (light background)-border:not(open):focus { background: #ededfc !important; color: #ffffff !important; box-shadow: inset 0 0 99999px rgba(255,255,255,0.2); }.vivid360-content-switcher-titles button.has-neutral system (light background)-border::selection {display: none; }.vivid360-content-switcher-titles button.has-neutral system (light background)-border:last-of-type { border-right: 2px solid #ededfc !important; }<\/style><link rel='stylesheet' id='vivid360-content-switcher-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/content-switcher\/css\/style.min.css?ver=1771503226' media='all' \/>\n\n<div class=\"wp-block-vivid360-content-switcher ml-0 mr-0 vivid360-content-switcher full-page-width has-2-tabs equal-width-tabs\"><div class=\"vivid360-content-switcher-titles\" role=\"tablist\" id=\"data\" aria-label=\"Content Switcher\" style=\"--activeTitleBgColor:var(--colorPrimary);--activeTitleTextColor:var(--colorWhite);--activeTitleBorderColor:var(--colorPrimary);--inactiveTitleBgColor:var(--colorWhite);--inactiveTitleTextColor:var(--colorPrimary);--inactiveTitleBorderColor:var(--colorPrimary);--inactiveHoverBgColor:var(--colorPrimary);--inactiveHoverTextColor:var(--colorPrimaryDark);--arrowIconColor:#333;--arrowBackgroundColor:#fff;justify-content:center\"><span class=\"vivid360-content-switcher-titles-left\"><\/span><button type=\"button\" role=\"tab\" aria-controls=\"tabpanel-1\" data-tab=\"1\" style=\"font-weight:bold;font-style:\" class=\"btn vivid360-content-switcher-title vivid360-content-switcher-title-1 open\" id=\"ClinicalEndpoints\" data-design-category=\"content_switcher\" data-event-name=\"content_switcher_click\" data-design-module=\"content_switcher\" aria-labelledby=\"tabpanel-1\">Clinical endpoints<div class=\"hover-background\" aria-hidden=\"true\"><\/div> <\/button><button type=\"button\" role=\"tab\" aria-controls=\"tabpanel-2\" data-tab=\"2\" style=\"font-weight:bold;font-style:\" class=\"btn vivid360-content-switcher-title vivid360-content-switcher-title-2\" id=\"AdditionalData\" data-design-category=\"content_switcher\" data-event-name=\"content_switcher_click\" data-design-module=\"content_switcher\" aria-labelledby=\"tabpanel-2\">Additional data<div class=\"hover-background\" aria-hidden=\"true\"><\/div><\/button><span class=\"vivid360-content-switcher-titles-right\"><\/span><\/div><div class=\"vivid360-content-switcher-contents\" data-opentab-custom=\"#fffbf0\"><link rel='stylesheet' id='vivid360-switcher-content-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/switcher-content\/css\/style.min.css?ver=1765194012' media='all' \/>\n\n<div class=\"vivid360-content-switcher-content vivid360-content-switcher-content-1 open\"><link rel='stylesheet' id='vivid360-heading-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/heading\/css\/style.min.css?ver=1765194012' media='all' \/>\n\n<div class=\"vivid360-heading\" id=\"a4653a3ff-2213-4e03-8514-1ede565363ee\"><h3 class=\"has-primary-color content-width fontWeightRegular\" style=\"--desktopFontSize:var(--h3FontSizeDesktop);--tabletFontSize:var(--h3FontSizeDesktop);--mobileFontSize:var(--h3FontSizeMobile);--desktopLineHeightSize:var(--h3LineHeightDesktop);--tabletLineHeightSize:var(--h3LineHeightDesktop);--mobileLineHeightSize:\" id=\"\">Proven to help provide robust RSV LRT disease protection<\/h3><\/div>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-dark-text-color\"><a href=\"#StudydesignCLEVER004trial\" aria-label=\"#\">See study design<\/a><\/mark><\/strong><\/p>\n\n\n\n<div style=\"background-color:transparent;height:16px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-16\"><\/div>\n\n\n<link rel='stylesheet' id='vivid360-image-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/image\/css\/style.min.css?ver=1777274844' media='all' \/>\n\n<div class=\"wp-block-vivid360-image\"><div class=\"img-container mr-0 ml-0 mt-0 mb-0\"><figure class=\"wp-block-vivid360-image is-style-default aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"2237\" height=\"1196\" src=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Table_Clincial-Endpoints_V3_RGB.svg?w=1024\" alt=\"Incidence of RSV-associated disease in infants born at greater than or equal to 29 weeks GA from Days 1 through 150 post-dose (CLEVER 004 Trial) superscript 1. Table row one, Medically attended (superscript c) LRI (requiring greater than or equal to 1 indicator of LRI or severity), Primary Endpoint: Criteria, Cough\/difficulty breathing and greater than or equal to 1 indicator of LRI (wheezing, rales\/crackles) or greater than or equal to 1 indicator of severity (chest wall in-drawing retractions, hypoxemia, tachypnea, and dehydration due to respiratory symptoms). Incidence rate (number of cases), ENFLONSIA (n=2,411): 0.026 (60), Placebo (n=1,203): 0.065 (74). Efficacy superscript a (95% CI) superscript b (p-value): 60.5% (44.2, 72.0) (p less than 0.001). Table row two, Hospitalization, Key Secondary Endpoint: Criteria, Admitted for respiratory illness superscript 2. Incidence rate (number of cases), ENFLONSIA (n=2,411): 0.004 (9), Placebo (n=1,203): 0.024 (28), Efficacy superscript a (95% CI) superscript b (p-value): 84.3% (66.7, 92.6.) (p less than 0.001).\" class=\"wp-image-1068  style-noshadow deskHeightAuto  \" style=\"height:1196px;width:2237px\" srcset=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/\/2026\/03\/CAT_Table_Clincial-Endpoints_V3_RGB.svg 2237w, https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/\/2026\/03\/CAT_Table_Clincial-Endpoints_V3_RGB.svg?resize=300,160 300w, https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/\/2026\/03\/CAT_Table_Clincial-Endpoints_V3_RGB.svg?resize=768,411 768w, https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/\/2026\/03\/CAT_Table_Clincial-Endpoints_V3_RGB.svg?resize=1024,547 1024w, https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/\/2026\/03\/CAT_Table_Clincial-Endpoints_V3_RGB.svg?resize=1536,821 1536w, https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/\/2026\/03\/CAT_Table_Clincial-Endpoints_V3_RGB.svg?resize=2048,1095 2048w\" sizes=\"auto, (max-width: 2237px) 100vw, 2237px\" \/><\/figure><\/div><\/div>\n\n\n\n<div style=\"background-color:transparent;--desktop-spacer:7px;--mobile-spacer:2px;--tablet-spacer:7px\" class=\"wp-block-vivid360-spacer vivid360-spacer-desktop vivid360-spacer-mobile vivid360-spacer-tablet\"><\/div>\n\n\n\n<p>Efficacy endpoints evaluated required an RSV-positive RT-PCR NP sample.<\/p>\n\n\n\n<div style=\"background-color:transparent;height:16px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-16\"><\/div>\n\n\n\n<p>n = Number of participants eligible in the full analysis set population.<\/p>\n\n\n\n<div style=\"background-color:transparent;height:16px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-16\"><\/div>\n\n\n\n<p><sup>a<\/sup>Efficacy for MALRI (requiring \u22651 indicator of LRI or severity) and hospitalization based on relative risk reduction against placebo adjusted for hemisphere at randomization, gestational age group, and age group at randomization.<\/p>\n\n\n\n<p><sup>b<\/sup>Estimate and 95% CI of efficacy were estimated from the modified Poisson regression with robust variance method.<\/p>\n\n\n\n<p><sup>c<\/sup>Medically attended included all health care provider visits in settings such as outpatient clinic, clinical study site, emergency department, urgent care center, and\/or hospital.<\/p>\n\n\n\n<div style=\"background-color:transparent;height:32px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-32\"><\/div>\n\n\n\n<div class=\"paragraph-wrapper\"><div class=\"_a569c7fb-53fd-499d-b3d7-c9382071c59d \" id=\"StudydesignCLEVER004trial\"><p class=\"has-medium-font-size\"><strong>Study design (CLEVER 004 trial): <\/strong>The efficacy and safety profile of ENFLONSIA was evaluated in an international, randomized, double-blind, Phase 2b\/3 study of healthy early and moderate preterm (\u226529 to &lt;35 weeks gestational age) and late preterm and full-term (\u226535 weeks gestational age) infants \u22641 year of age entering their first RSV season. Participants were randomized 2:1 to receive a single 105 mg dose of ENFLONSIA or saline placebo by IM injection.<sup>1<\/sup><\/p><\/div><\/div>\n\n\n\n<div style=\"background-color:transparent;height:16px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-16\"><\/div>\n\n\n\n<p>CI, confidence interval; ICU, intensive care unit; IM, intramuscular; LRI, lower respiratory infection; LRT, lower respiratory tract; MALRI, medically attended lower respiratory infection; NP, nasopharyngeal; NVSN, New Vaccine Surveillance Network; RT-PCR, reverse transcriptase polymerase chain reaction.<\/p>\n\n\n\n<div style=\"background-color:transparent;height:16px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-16\"><\/div>\n\n\n\n<div class=\"wp-block-vivid360-button-parent btn-block-container content-width button-justify-center mb-0 mt-0\"><link rel='stylesheet' id='vivid360-button-block-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/button\/css\/style.min.css?ver=1765966675' media='all' \/>\n<link rel='stylesheet' id='vivid360-button-parent-block-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/button-parent\/css\/style.min.css?ver=6.8.5' media='all' \/>\n\n<div class=\"vivid360-button-block fullWidth-mobile custom-width-229px\"><a class=\"btn primary primary-large  mt-0 mb-0\" role=\"button\" style=\"font-size:14px;letter-spacing:0.86px;border-radius:10px;border-style:solid;justify-content:center;text-align:center;width:100%\" href=\"https:\/\/www.merckvaccines.com\/enflonsia\/safety-profile\/\" title=\"See safety profile\" target=\"_self\" rel=\"noopener\" data-design-category=\"button\" data-design-label=\"See safety profile\" data-design-module=\"element\" data-event-name=\"element_click\">See safety profile<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"vivid360-content-switcher-content vivid360-content-switcher-content-2\">\n<div class=\"vivid360-heading default-hcp-tablet-fontsize\" id=\"a5d04e6ab-b437-4371-8f53-5bbcab7dd3e1\"><h2 class=\"has-primary-color content-width fontWeightBold mt-0\" style=\"--desktopFontSize:26px;--tabletFontSize:var(--h2FontSizeDesktop);--mobileFontSize:26px;--desktopLineHeightSize:39px;--tabletLineHeightSize:var(--h2LineHeightDesktop);--mobileLineHeightSize:\" id=\"\">Additional data from CLEVER trial<sup>1<\/sup><\/h2><\/div>\n\n\n\n<div style=\"background-color:transparent;height:8px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-8\"><\/div>\n\n\n\n<p class=\"has-regular-font-size\"><strong><a href=\"#StudyLimitations\" aria-label=\"#\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-dark-text-color\">See study limitations<\/mark><\/a><\/strong><\/p>\n\n\n\n<div style=\"background-color:transparent;--desktop-spacer:30px;--mobile-spacer:30px;--tablet-spacer:30px\" class=\"wp-block-vivid360-spacer vivid360-spacer-desktop vivid360-spacer-mobile vivid360-spacer-tablet\"><\/div>\n\n\n<link rel='stylesheet' id='vivid360-image-module-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/image-module\/css\/style.min.css?ver=1773745655' media='all' \/>\n\n<div id=\"\" class=\"wp-block-vivid360-image-module ratio-50-50 content-above one-col full-page-width\"><div class=\"vivid360-block-image-module__content-wrapper content-align-left\" id=\"contentDiv\"><\/div><figure class=\"vivid360-block-image-module__image-container\"><picture><source media=\"(max-width: 767px)\" data-srcset=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Table_Additional-Data_Post-Hoc-Analysis_HCP-Site_RGB_Fonts-Outlined-1.svg?w=767\"\/><source media=\"(min-width: 768px) and (max-width: 1440px)\" data-srcset=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Table_Additional-Data_Post-Hoc-Analysis_HCP-Site_RGB_Fonts-Outlined-1.svg?w=1440\"\/><img decoding=\"async\" width=\"506.52\" height=\"341.94\" data-src=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Table_Additional-Data_Post-Hoc-Analysis_HCP-Site_RGB_Fonts-Outlined-1.svg\" loading=\"lazy\" src=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Table_Additional-Data_Post-Hoc-Analysis_HCP-Site_RGB_Fonts-Outlined-1.svg\" alt=\"Incidence of RSV-associated disease in infants born at greater than or equal to 29 weeks GA from Days 1 through 150 post-dose superscript 1,d. Table row one, LRI hospitalization Exploratory Endpoint. Criteria, Admitted for respiratory illness superscript 2 and Cough\/difficulty breathing and greater than or equal to 1 indicator of LRI (wheezing, rales\/crackles) or greater than or equal to indicator of severity (chest wall in-drawing\/retractions, hypoxemia, tachypnea, and dehydration due to respiratory symptoms). Incidence rate (number of cases) ENFLONSIA (n=2,398): 0.002 (5), Placebo (n = 1,201): 0.023 (27). Observed efficacy superscript e per exploratory endpoints (95% CI), 90.9% (76.2, 96.5). Table row two, Severe medically attended LRI Exploratory Endpoint. Criteria, Cough\/difficulty breathing and Severe disease (severe hypoxemia or the need for supplemental oxygen or mechanical ventilatory support). Incidence rate (number of cases) ENFLONSIA (n= 2,398): 0.001 (2), Placebo (n =1,201): 0.010 (12), Observed efficacy superscript e per exploratory endpoints (95% CI): 91.7% (62.9, 98.1). Table row three, Medically attended LRI (requiring at greater than or equal to 2 indicators of LRI\/severity) Post-Hoc Analysis. Criteria, greater than or equal to Indicator of LRI (wheezing, rales\/crackles, rhonchi) and greater than or equal to 1 indicator of severity (chest wall in-drawing\/retractions, hypoxemia, tachypnea, and dehydration due to respiratory symptoms. Incidence rate (number of cases) ENFLONSIA (n=2,398): 0.004 (10), Placebo (n = 1,201): 0.035 (41), Observed efficacy superscript b per analyses (95% Cl): 88.0% (761,94.0)\"\/><\/picture><figcaption class=\"caption-align-left noCaptionText\" id=\"figcaption\"><p class=\"caption-title vivid360-block-image-module__caption\" style=\"--captionFontSize:14px;--captionFontSizeTablet:14px;--captionFontSizeMobile:14px\"><\/p><\/figcaption><\/figure><\/div>\n\n\n\n<div style=\"background-color:transparent;--desktop-spacer:23px;--mobile-spacer:18px;--tablet-spacer:23px\" class=\"wp-block-vivid360-spacer vivid360-spacer-desktop vivid360-spacer-mobile vivid360-spacer-tablet\"><\/div>\n\n\n\n<div class=\"paragraph-wrapper wp-elements-c7065e159a725165dee7603a610a9dd9\"><div class=\"_0e45b4e4-b1b5-4cbe-8caa-96d5f304018b \" id=\"\"><p class=\"has-dark-text-color has-text-color has-link-color has-regular-font-size\">Efficacy endpoints evaluated required an RSV-positive RT-PCR NP sample.<sup>2<\/sup><\/p><\/div><\/div>\n\n\n\n<div style=\"background-color:transparent;--desktop-spacer:9px;--mobile-spacer:7px;--tablet-spacer:9px\" class=\"wp-block-vivid360-spacer vivid360-spacer-desktop vivid360-spacer-mobile vivid360-spacer-tablet\"><\/div>\n\n\n\n<p class=\"has-dark-text-color has-text-color has-link-color has-regular-font-size wp-elements-2f623a80fc18a227e9bb4bae9993bfcd\">n=Number of participants eligible for inclusion in the full analysis set population.<\/p>\n\n\n\n<div style=\"background-color:transparent;--desktop-spacer:9px;--mobile-spacer:7px;--tablet-spacer:9px\" class=\"wp-block-vivid360-spacer vivid360-spacer-desktop vivid360-spacer-mobile vivid360-spacer-tablet\"><\/div>\n\n\n\n<p class=\"has-dark-text-color has-text-color has-link-color has-regular-font-size wp-elements-f6c77f1cee97dc00b28cf045ee95acae\"><sup>d<\/sup>Results presented reflect those within CLEVER 004 Clinical Study. The denominators of these results, which reflect total evaluated participants for the exploratory endpoints, differ slightly from the denominators reflected in the US Prescribing Information, which inform the primary and key secondary endpoints.<sup>1<\/sup><\/p>\n\n\n\n<div style=\"background-color:transparent;--desktop-spacer:9px;--mobile-spacer:7px;--tablet-spacer:9px\" class=\"wp-block-vivid360-spacer vivid360-spacer-desktop vivid360-spacer-mobile vivid360-spacer-tablet\"><\/div>\n\n\n\n<p class=\"has-dark-text-color has-text-color has-link-color has-regular-font-size wp-elements-1c91728f02f1826fa691f1ef1590dcbb\"><sup>e<\/sup>Estimate and 95% CI of observed efficacy were estimated from the modified Poisson regression with robust variance method.<\/p>\n\n\n\n<div style=\"background-color:transparent;height:32px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-32\"><\/div>\n\n\n<link rel='stylesheet' id='vivid360-row-module-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/row\/css\/style.min.css?ver=6.8.5' media='all' \/>\n\n<div style=\"border-width:0px;border-style:;border-radius:25px;background-color:#d0f5c2\" class=\"wp-block-vivid360-row vivid360-row hcp-regular-bg-width wide-bg-width\"><div class=\"cropped\" id=\"row0c474ec7-334f-4e64-988f-bfb1c74082bd\"><div style=\"padding-top:20px;padding-bottom:20px;padding-right:40px;padding-left:45px\" class=\"row-content wide-width hcp-regular-width\">\n<div class=\"vivid360-heading\" id=\"a81631f50-f133-4556-9250-6ba7dd05e37b\"><h3 class=\"has-primary-color content-width fontWeightBold\" style=\"--desktopFontSize:18px;--tabletFontSize:var(--h3FontSizeDesktop);--mobileFontSize:18px;--desktopLineHeightSize:27px;--tabletLineHeightSize:var(--h3LineHeightDesktop);--mobileLineHeightSize:\" id=\"StudyLimitations\">Study limitations:<\/h3><\/div>\n\n\n<link rel='stylesheet' id='vivid360-list-parent-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/list-parent\/css\/style.css?ver=1765194012' media='all' \/>\n\n<div class=\"vivid-block-list2 content-width  \">\n<ul style=\"--listBulletColor:#006b49\" class=\"list-bullet-color has-dark-text-color has-text-color\">\n<li class=\"has-medium-font-size\">No formal statistical testing was planned for the prespecified exploratory endpoints<\/li>\n\n\n\n<li class=\"has-medium-font-size\">No conclusions can be drawn from these results and they should be interpreted with caution<\/li>\n<\/ul>\n<\/div>\n<\/div><\/div><\/div>\n\n\n\n<div style=\"background-color:transparent;height:16px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-16\"><\/div>\n\n\n\n<p>CI, confidence interval; ICU, intensive care unit; IM, intramuscular; LRI, lower respiratory infection; LRT, lower respiratory tract; MALRI, medically attended lower respiratory infection; NP, nasopharyngeal; NVSN, New Vaccine Surveillance Network; RT-PCR, reverse transcriptase polymerase chain reaction.<\/p>\n\n\n\n<div style=\"background-color:transparent;height:16px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-16\"><\/div>\n\n\n\n<div class=\"wp-block-vivid360-button-parent btn-block-container content-width button-justify-center mb-0 mt-0\">\n<div class=\"vivid360-button-block fullWidth-mobile custom-width-229px\"><a class=\"btn primary primary-large  mt-0 mb-0\" role=\"button\" style=\"font-size:14px;letter-spacing:0.86px;border-radius:10px;border-style:solid;justify-content:center;text-align:center;width:100%\" href=\"https:\/\/www.merckvaccines.com\/enflonsia\/safety-profile\/\" title=\"See safety profile\" target=\"_self\" rel=\"noopener\" data-design-category=\"button\" data-design-label=\"See safety profile\" data-design-module=\"element\" data-event-name=\"element_click\">See safety profile<\/a><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<div style=\"background-color:transparent;height:56px\" class=\"wp-block-vivid360-spacer vivid360-spacer spacer-56\"><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><link rel='stylesheet' id='vivid360-card-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/card\/css\/style.min.css?ver=1777274844' media='all' \/>\n\n<div id=\"\" class=\"wp-block-vivid360-card a89bf0140-20f1-4adf-9b2b-b876b6338794 vivid360-block-card has-text-align-left hasBoxShadow card-horizontal has-dark-text-color full-page-width\" style=\"border-width:0px;border-style:;border-radius:0\"><div class=\"card-media \"><i role=\"img\" aria-label=\"\" aria-hidden=\"true\" class=\"icon-stethoscope \"><\/i><\/div><div class=\"card-content\"><div class=\"card-content-wrap\"><h3 class=\"card-header fontWeightBold\">ENFLONSIA safety profile<\/h3><p class=\"card-link entire-card left\"><a class=\"\" href=\"https:\/\/www.merckvaccines.com\/enflonsia\/safety-profile\/\" role=\"button\" style=\"border-radius:4px\" title=\"\" target=\"_self\" rel=\"noopener\" data-design-category=\"link\" data-design-label=\"\" data-design-module=\"element\"><\/a><\/p><\/div><div class=\"\"><div class=\"card-icon-right\"><i role=\"link\" aria-label=\"\" aria-hidden=\"true\" class=\"icon-arrow-right\"><\/i><\/div><\/div><\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div id=\"\" class=\"wp-block-vivid360-card a122b93e4-d26a-4a3e-8a13-a4b5fd39e5ed vivid360-block-card has-text-align-left hasBoxShadow card-horizontal has-dark-text-color full-page-width\" style=\"border-width:0px;border-style:;border-radius:0\"><div class=\"card-media \"><i role=\"img\" aria-label=\"\" aria-hidden=\"true\" class=\"icon-syringe \"><\/i><\/div><div class=\"card-content\"><div class=\"card-content-wrap\"><h3 class=\"card-header fontWeightBold\">ENFLONSIA dosing &amp; administration<\/h3><p class=\"card-link entire-card left\"><a class=\"\" href=\"https:\/\/www.merckvaccines.com\/enflonsia\/dosing-administration\/\" role=\"button\" style=\"border-radius:4px\" title=\"\" target=\"_self\" rel=\"noopener\" data-design-category=\"link\" data-design-label=\"\" data-design-module=\"element\"><\/a><\/p><\/div><div class=\"\"><div class=\"card-icon-right\"><i role=\"link\" aria-label=\"\" aria-hidden=\"true\" class=\"icon-arrow-right\"><\/i><\/div><\/div><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"vivid360-heading default-hcp-fontsize default-hcp-tablet-fontsize default-hcp-mobile-fontsize\" id=\"a7c19542b-37ad-4f01-99f0-70a3c4d22af9\"><h2 class=\"content-width fontWeightRegular\" style=\"--desktopFontSize:var(--h2FontSizeDesktop);--tabletFontSize:var(--h2FontSizeDesktop);--mobileFontSize:var(--h2FontSizeMobile);--desktopLineHeightSize:var(--h2LineHeightDesktop);--tabletLineHeightSize:var(--h2LineHeightDesktop);--mobileLineHeightSize:\" id=\"\"><strong>References:<\/strong><\/h2><\/div>\n\n\n\n<div class=\"vivid-block-list2 content-width  \">\n<ol style=\"--listBulletColor:#333\" class=\"list-bullet-color\">\n<li>Zar HJ, Sim\u00f5es EAF, Madhi SA, et al. Clesrovimab for Prevention of RSV Disease in Healthy Infants. <em>N Engl J Med<\/em>. 2025;393:1292-1303. DOI: 10.1056\/NEJMoa2502984<\/li>\n\n\n\n<li>Zar HJ, Sim\u00f5es EAF, Madhi SA, et al. Supplementary appendix to: Clesrovimab for prevention of RSV disease in healthy infants. <em>N Engl J Med<\/em>. 2025;393(13):1292-1303. doi:10.1056\/NEJMoa2502984<\/li>\n<\/ol>\n<\/div>\n\n\n<link rel='stylesheet' id='vivid360-modal-css-css' href='https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/themes\/cex-wpvip-mhh-merck-vivid360-theme-1-12\/blocks\/modal\/css\/style.min.css?ver=1769175837' media='all' \/>\n\n<div class=\"wp-block-vivid360-modal\"><div><div class=\"vivid360-modal-block-container is-style-passive-modal-two-btn\"><div class=\"vivid360-modal-trigger-container\"><span id=\"inlineTrigger\" role=\"link\" data-design-module=\"modal\" data-design-category=\"link\" class=\"vivid360-modal-trigger vivid360-modal-trigger-hide\">patientSite<\/span><\/div><div class=\"vivid360-modal-container null\"><div class=\"vivid360-modal\" style=\"color:#00857c\"><div class=\"vivid360-modal-content-area\"><a class=\"vivid360-modal-close-modal-span\" role=\"button\" aria-label=\"modal popup close\"><i class=\"icon-close\"><\/i><\/a><div class=\"modal-flex-container\"><div class=\"vivid360-modal-label-container  title-left\" style=\"--titleColor:#00857c\"><h2><\/h2><\/div><div class=\"vivid360-modal-content-container has-regular-font-size\">\n\n<div class=\"paragraph-wrapper\"><div class=\"_3c64b9a1-a26b-4dae-b840-ffc7182efbb0 \" id=\"\"><p style=\"font-size:24px\"><strong>By clicking on this link, you will be leaving Merck Vaccines.<\/strong><\/p><\/div><\/div>\n\n<\/div><div class=\"vivid360-modal-button-container desktop-container\"><div class=\"vivid360-button-block\"><a class=\"btn primary primary-regular btn-confirm has-white-background-color vivid360-modal-dismiss-button\" role=\"button\" aria-label=\"Button 1\" style=\"font-size:14px;border-style:solid;border-color:#00857c;color:#00857c\" href=\"#!\" title=\"Cancel\" target=\"_self\" rel=\"noopener\" data-design-category=\"button\" data-design-label=\"Cancel\" data-design-module=\"element\">Cancel<\/a><\/div><div class=\"vivid360-button-block\"><a class=\"btn primary primary-regular btn-dismissive  vivid360-modal-action-button\" role=\"button\" aria-label=\"Button 2\" style=\"font-size:14px;border-style:solid;border-color:#00857c;background-color:#00857c\" href=\"https:\/\/www.enflonsia.com\/\" title=\"Proceed\" target=\"_blank\" rel=\"noopener\" data-design-category=\"button\" data-design-label=\"Proceed\" data-design-module=\"element\">Proceed<\/a><\/div><\/div><\/div><\/div><div class=\"vivid360-modal-button-container mobile-container \"><div class=\"vivid360-button-block\"><a class=\"btn primary primary-regular btn-confirm has-white-background-color vivid360-modal-dismiss-button\" role=\"button\" aria-label=\"Button 1\" style=\"font-size:14px;border-style:solid;border-color:#00857c;color:#00857c\" href=\"#!\" title=\"Cancel\" target=\"_self\" rel=\"noopener\" data-design-category=\"button\" data-design-label=\"Cancel\" data-design-module=\"element\">Cancel<\/a><\/div><div class=\"vivid360-button-block\"><a class=\"btn primary primary-regular btn-dismissive  vivid360-modal-action-button\" role=\"button\" aria-label=\"Button 2\" style=\"font-size:14px;border-style:solid;border-color:#00857c;background-color:#00857c\" href=\"https:\/\/www.enflonsia.com\/\" title=\"Proceed\" target=\"_blank\" rel=\"noopener\" data-design-category=\"button\" data-design-label=\"Proceed\" data-design-module=\"element\">Proceed<\/a><\/div><\/div><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":4249,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_trash_the_other_posts":false,"editor_notices":[],"footnotes":""},"ga4_page_audience":[203],"ga4_page_birn_id":[],"ga4_page_branding":[220],"ga4_page_businessunit":[],"ga4_page_campaign":[],"ga4_page_content_purpose":[236],"ga4_page_customer_journey_stage":[297],"ga4_page_customer_specialty":[345],"ga4_page_experience":[],"ga4_page_indication":[],"ga4_page_material_intent":[551],"ga4_page_product":[779],"ga4_page_region":[976],"ga4_page_therapeuticarea":[],"class_list":["post-1065","page","type-page","status-publish"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Clinical Studies for ENFLONSIA\u2122 (clesrovimab-cfor)<\/title>\n<meta name=\"description\" content=\"View information on a clinical study for ENFLONSIA\u2122 (clesrovimab-cfor), the CLEVER 004 Trial, and learn more about the study design and disease incidence.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.merckvaccines.com\/enflonsia\/clinical-studies\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Clinical Studies for ENFLONSIA\u2122 (clesrovimab-cfor)\" \/>\n<meta property=\"og:description\" content=\"View information on a clinical study for ENFLONSIA\u2122 (clesrovimab-cfor), the CLEVER 004 Trial, and learn more about the study design and disease incidence.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.merckvaccines.com\/enflonsia\/clinical-studies\/\" \/>\n<meta property=\"og:site_name\" content=\"clesrovimab\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-23T09:02:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Desktop_Clinical-Data_RGB.jpg?w=1488\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Clinical Studies for ENFLONSIA\u2122 (clesrovimab-cfor)","description":"View information on a clinical study for ENFLONSIA\u2122 (clesrovimab-cfor), the CLEVER 004 Trial, and learn more about the study design and disease incidence.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.merckvaccines.com\/enflonsia\/clinical-studies\/","og_locale":"en_US","og_type":"article","og_title":"Clinical Studies for ENFLONSIA\u2122 (clesrovimab-cfor)","og_description":"View information on a clinical study for ENFLONSIA\u2122 (clesrovimab-cfor), the CLEVER 004 Trial, and learn more about the study design and disease incidence.","og_url":"https:\/\/www.merckvaccines.com\/enflonsia\/clinical-studies\/","og_site_name":"clesrovimab","article_modified_time":"2026-03-23T09:02:24+00:00","og_image":[{"url":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Desktop_Clinical-Data_RGB.jpg?w=1488","type":"","width":"","height":""}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.merckvaccines.com\/enflonsia\/clinical-studies\/","url":"https:\/\/www.merckvaccines.com\/enflonsia\/clinical-studies\/","name":"Clinical Studies for ENFLONSIA\u2122 (clesrovimab-cfor)","isPartOf":{"@id":"https:\/\/www.merckvaccines.com\/enflonsia\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.merckvaccines.com\/enflonsia\/clinical-studies\/#primaryimage"},"image":{"@id":"https:\/\/www.merckvaccines.com\/enflonsia\/clinical-studies\/#primaryimage"},"thumbnailUrl":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Desktop_Clinical-Data_RGB.jpg?w=1488","datePublished":"2026-03-05T10:37:42+00:00","dateModified":"2026-03-23T09:02:24+00:00","description":"View information on a clinical study for ENFLONSIA\u2122 (clesrovimab-cfor), the CLEVER 004 Trial, and learn more about the study design and disease incidence.","breadcrumb":{"@id":"https:\/\/www.merckvaccines.com\/enflonsia\/clinical-studies\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.merckvaccines.com\/enflonsia\/clinical-studies\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.merckvaccines.com\/enflonsia\/clinical-studies\/#primaryimage","url":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Desktop_Clinical-Data_RGB.jpg","contentUrl":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-content\/uploads\/sites\/276\/2026\/03\/CAT_Hero-Image_Desktop_Clinical-Data_RGB.jpg","width":4512,"height":1012},{"@type":"BreadcrumbList","@id":"https:\/\/www.merckvaccines.com\/enflonsia\/clinical-studies\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.merckvaccines.com\/enflonsia\/"},{"@type":"ListItem","position":2,"name":"Clinical studies"}]},{"@type":"WebSite","@id":"https:\/\/www.merckvaccines.com\/enflonsia\/#website","url":"https:\/\/www.merckvaccines.com\/enflonsia\/","name":"clesrovimab","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.merckvaccines.com\/enflonsia\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"}]}},"acf":[],"_links":{"self":[{"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/pages\/1065","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/users\/4249"}],"replies":[{"embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/comments?post=1065"}],"version-history":[{"count":5,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/pages\/1065\/revisions"}],"predecessor-version":[{"id":1219,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/pages\/1065\/revisions\/1219"}],"wp:attachment":[{"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/media?parent=1065"}],"wp:term":[{"taxonomy":"ga4_page_audience","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_audience?post=1065"},{"taxonomy":"ga4_page_birn_id","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_birn_id?post=1065"},{"taxonomy":"ga4_page_branding","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_branding?post=1065"},{"taxonomy":"ga4_page_businessunit","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_businessunit?post=1065"},{"taxonomy":"ga4_page_campaign","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_campaign?post=1065"},{"taxonomy":"ga4_page_content_purpose","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_content_purpose?post=1065"},{"taxonomy":"ga4_page_customer_journey_stage","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_customer_journey_stage?post=1065"},{"taxonomy":"ga4_page_customer_specialty","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_customer_specialty?post=1065"},{"taxonomy":"ga4_page_experience","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_experience?post=1065"},{"taxonomy":"ga4_page_indication","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_indication?post=1065"},{"taxonomy":"ga4_page_material_intent","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_material_intent?post=1065"},{"taxonomy":"ga4_page_product","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_product?post=1065"},{"taxonomy":"ga4_page_region","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_region?post=1065"},{"taxonomy":"ga4_page_therapeuticarea","embeddable":true,"href":"https:\/\/www.merckvaccines.com\/enflonsia\/wp-json\/wp\/v2\/ga4_page_therapeuticarea?post=1065"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}