pneumococcal vaccine
Definition: vaccine composed 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.); some types have been conjugated with protein to make them antigenic for children younger than 2 years of age.
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Examples: glitazone, GI cocktail, etc.
