Burden of disease
Pneumococcal pneumonia and IPD are a serious risk for adult patients1-4
Pneumococcal pneumonia is the most common clinical manifestation of pneumococcal disease in adults.5 It leads to ~225,000 US hospitalizations annually and is estimated to account for 10 to 30% of all adult community-acquired pneumonia (CAP) cases in the US.5,6 CAP occurs when someone develops pneumonia outside of a hospital.7


Pneumococcal pneumonia leads to ~225,000 hospitalizations annually in the US6
The same bacteria that cause pneumococcal pneumonia, Streptococcus pneumoniae, can invade normally sterile sites in the body, such as the blood or cerebrospinal fluid. When this occurs, it is referred to as IPD. IPD is a serious illness that can lead to hospitalization, complications including bacteremia and meningitis, and sometimes death.5
In the US, IPD is ~6x more likely to lead to death in adults over the age of 50, compared to those aged 18-49.8-12,a
Annual rate of IPD in US adults, 2019-20238-12,a
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aBased on CDC ABC surveillance data from the years 2019–2023, representing ~35 million persons and 10 states across the US. Regional variations may exist.6,8-12
ABC, Active Bacterial Core; CAP, community acquired pneumonia; CDC, Centers for Disease Control and Prevention; IPD, invasive pneumococcal disease; US, United States.
References:
- ABCs bact facts interactive data dashboard. SPN serotypes 1998-2023. Centers for Disease Control and Prevention. August 21, 2025. Accessed August 27, 2025. https://www.cdc.gov/abcs/bact-facts/data-dashboard.html
- Grant LR, Meche A, McGrath L, et al. Risk of pneumococcal disease in US adults by age and risk profile. Open Forum Infect Dis. 2023;10(5):ofad192. Doi:10.1093/ofid/ofad192
- Grant LR, Meche A, McGrath L, et al. Supplementary material to: Risk of pneumococcal disease in US adults by age and risk profile. Open Forum Infect Dis. 2023;10(5):ofad192. Doi:10.1093/ofid/ofad192
- Clinical features of pneumococcal disease. Centers for Disease Control and Prevention. February 6, 2024. Accessed August 1, 2025. https://www.cdc.gov/pneumococcal/hcp/clinical-signs/
- Gierke R, Wodi P, Kobayashi M. Epidemiology and Prevention of Vaccine-Preventable Diseases (Pink Book). 14th edition. Chapter 17: Pneumococcal disease. Centers for Disease Control and Prevention. May 1, 2024. Accessed August 15, 2025. https://www.cdc.gov/pinkbook/hcp/table-of-contents/chapter-17-pneumococcal-disease.html
- Kobayashi M, Leidner AJ, Gierke R, et al. Expanded recommendations for use of pneumococcal conjugate vaccines among adults aged ≥50 years: recommendations of the Advisory Committee on Immunization Practices — United States, 2024. MMWR Morb Mortal Wkly Rep. 2025;74(1):1-8. doi:10.15585/mmwr.mm7401a1
- About pneumonia. Centers for Disease Control and Prevention. October 7, 2024. Accessed October 14, 2024. https://www.cdc.gov/pneumonia/about/
- Active Bacterial Core surveillance (ABCs) report, Emerging Infections Program network, Streptococcus pneumoniae, 2019. Centers for Disease Control and Prevention. Updated June 16, 2021. Accessed August 1, 2025. https://www.cdc.gov/abcs/downloads/SPN_Surveillance_Report_2019.pdf
- Active Bacterial Core surveillance (ABCs) report, Emerging Infections Program network, Streptococcus pneumoniae, 2020. Centers for Disease Control and Prevention. Updated September 20, 2022. Accessed August 1, 2025. https://stacks.cdc.gov/view/cdc/140328
- Active Bacterial Core surveillance (ABCs) report, Emerging Infections Program network, Streptococcus pneumoniae, 2021. Centers for Disease Control and Prevention. Updated June 2, 2023. Accessed August 4, 2025. https://www.cdc.gov/abcs/downloads/SPN_Surveillance_Report_2021.pdf
- Active Bacterial Core surveillance (ABCs) report, Emerging Infections Program network, Streptococcus pneumoniae, 2022. Centers for Disease Control and Prevention. Updated July 5, 2024. August 1, 2025. https://www.cdc.gov/abcs/downloads/SPN_Surveillance_Report_2022.pdf
- Active Bacterial Core surveillance (ABCs) report, Emerging Infections Program network, Streptococcus pneumoniae, 2023. Centers for Disease Control and Prevention. Updated March 20, 2025. Accessed July 28, 2025. https://www.cdc.gov/abcs/downloads/SPN_Surveillance_Report_2023.pdf