Streptococcus Pneumoniae Type 11A Capsular Polysaccharide Antigen
Streptococcus Pneumoniae Type 11a Capsular Polysaccharide Antigen is a vaccine component used to induce immunity against pneumococcal disease caused by S. pneumoniae serotype 11a. It is included as one of multiple serotype antigens in pneumococcal polysaccharide vaccines to provide protection against pneumonia, meningitis, bloodstream infections, and ear infections in at-risk populations.
A vaccine antigen component that provides serotype-specific protection against pneumococcal infections including pneumonia and meningitis.
Key facts at a glance
- RxNorm
- 854934
- Generic
- Streptococcus Pneumoniae Type 11a 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.
Prevention of invasive pneumococcal disease, pneumonia, meningitis, bacteremia, and otitis media caused by Streptococcus pneumoniae serotype 11a. Used as a component in polyvalent pneumococcal polysaccharide vaccines for adults and children per age-appropriate vaccination schedules.
The capsular polysaccharide antigen stimulates B-cell mediated immune response without T-cell dependence, inducing serotype-specific IgG antibodies that opsonize and facilitate clearance of S. pneumoniae type 11a bacteria.
This antigen is one component of a multivalent vaccine; protection is limited to included serotypes only. Not a substitute for antibiotic treatment of active infection. Contraindications include severe hypersensitivity to any vaccine component. Immunocompromised individuals may have reduced response.
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