Streptococcus Pneumoniae Type 9V Capsular Polysaccharide Antigen
This is a purified capsular polysaccharide antigen derived from Streptococcus pneumoniae serotype 9V, used as a component in pneumococcal vaccines. It stimulates the immune system to produce antibodies against pneumococcal bacteria, helping prevent serious infections like pneumonia, meningitis, and bloodstream infections in vaccinated individuals.
A vaccine antigen that protects against Streptococcus pneumoniae serotype 9V by stimulating immune antibody production.
Key facts at a glance
- RxNorm
- 854974
- Generic
- Streptococcus Pneumoniae Type 9v Capsular Polysaccharide Antigen
- Class
- unclassified
- Brands
- Pneumovax 23
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- prefilled syringe, injection, solution
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Used as a component in pneumococcal polysaccharide vaccines (PPSV) to prevent invasive pneumococcal disease caused by serotype 9V, including pneumonia, bacteremia, and meningitis. These vaccines are typically recommended for adults over 65 and individuals with certain chronic conditions or immunocompromised states.
The capsular polysaccharide antigen is recognized by the immune system as foreign, stimulating B-cells to produce type-specific antibodies. These antibodies bind to the polysaccharide capsule of S. pneumoniae, marking the bacteria for destruction by phagocytes and complement-mediated killing.
This antigen is for immunization only and does not treat active infection. As with all vaccines, protection depends on individual immune response. Contraindications include severe hypersensitivity to vaccine components. Side effects may include injection site reactions, fever, and fatigue. Effectiveness varies by individual and does not cover all pneumococcal serotypes.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 31, 2026. · Read our editorial policy