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Definition of Pneumococcal vaccine
1. Noun. Vaccine (trade name Pneumovax) effective against the 23 most common strains of pneumococcus.
Medical Definition of Pneumococcal vaccine
1. Vaccine comprised of purified capsular polysaccharide antigen from 23 types of Streptococcus pneumoniae (representing those types responsible for most of the reported pneumococcal diseases in the U.S.). (05 Mar 2000)