Streptococcus Pneumoniae Type 33F Capsular Polysaccharide Antigen
Streptococcus pneumoniae type 33f capsular polysaccharide antigen is a purified bacterial component derived from the polysaccharide capsule of S. pneumoniae serotype 33f. This antigen is used in the formulation of pneumococcal vaccines to induce immune protection against infections caused by this specific serotype. The capsular polysaccharide antigen stimulates the body to produce type-specific antibodies that help defend against pneumococcal disease.
A purified bacterial antigen used in pneumococcal vaccines to provide serotype-specific protection against Streptococcus pneumoniae infections.
Key facts at a glance
- RxNorm
- 854960
- Generic
- Streptococcus Pneumoniae Type 33f 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 used in the manufacture of pneumococcal polysaccharide vaccines, which help protect against pneumonia, meningitis, bloodstream infections, and other serious infections caused by Streptococcus pneumoniae serotype 33f. It is a component intended for incorporation into multi-valent vaccine formulations rather than standalone use.
The capsular polysaccharide antigen stimulates the immune system by mimicking the natural bacterial surface. When recognized as foreign, it prompts B cells to produce type-specific antibodies that can neutralize and help eliminate pneumococcal bacteria expressing the 33f capsular polysaccharide during actual infection.
As a vaccine component, this antigen should only be administered as part of an approved vaccine formulation by qualified healthcare professionals. Vaccine recipients should be monitored for typical post-vaccination responses including soreness at injection site, mild fever, or fatigue. Individuals with known hypersensitivity to pneumococcal vaccine components should not receive these products.
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