has role immunizes against disease immunizes against pathogen Streptococcus pneumonia Streptococcus pneumoniae polyvalent pneumococcal vaccine Pnu-Imune vaccine vaccine Vaccine with brand name Pnu-Imune, designed to protect against 23 different types of Streptococcus pneumoniae bacteria, which are responsible for causing pneumonia, meningitis, and bloodstream infections. https://www.drugs.com/cons/pnu-imune-23.html Pnu-Imune 23 vaccine multivalent role capsular polysaccharide vaccine role