Polyvalent Pneumococcal Vaccine Sufficient An polyvalent vaccine used to prevent infection by the bacterium Streptococcus pneumoniae. Pneumococcal polyvalent vaccine contains highly purified capsular antigens from the 23 most prevalent or invasive pneumococcal types of Streptococcus pneumoniae to ensure cross-protection. Following vaccination, protective capsular type-specific antibody levels typically develop by the third week; serotype-specific antibody levels generally decline after 5-10 years. Pneumococcal Polysaccharide Vaccine SCDO:0000915 PPSV Pneumococcal Polyvalent Vaccine http://bioportal.bioontology.org/ontologies/NCIT/?p=classes&conceptid=http%3A%2F%2Fncicb.nci.nih.gov%2Fxml%2Fowl%2FEVS%2FThesaurus.owl%23C1643&jump_to_nav=true NCIT:C1643 Streptococcus Pneumoniae Vaccine