Streptococcus Pneumoniae Type 3 Capsular Polysaccharide Antigen
Streptococcus Pneumoniae Type 3 Capsular Polysaccharide Antigen is a purified bacterial component used in vaccines to help protect against pneumococcal infections caused by serotype 3. This antigen stimulates the immune system to produce antibodies against the polysaccharide capsule of the bacteria.
A vaccine antigen that provides immunity against Streptococcus pneumoniae serotype 3 bacteria.
Key facts at a glance
- RxNorm
- 854958
- Generic
- Streptococcus Pneumoniae Type 3 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.
This antigen is included in pneumococcal vaccines to help prevent invasive pneumococcal disease, pneumonia, and related infections caused by Streptococcus pneumoniae serotype 3, particularly in populations at increased risk such as older adults and individuals with certain chronic conditions.
The capsular polysaccharide antigen stimulates the immune system to recognize and mount a defensive response against S. pneumoniae type 3 bacteria by inducing specific antibody production against the polysaccharide capsule.
As a vaccine antigen component rather than a standalone medication, it is always administered as part of a complete vaccine formulation. Side effects are generally mild and may include injection site reactions. Specific vaccine recommendations should be discussed with a healthcare provider.
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