title: Efficacy of pneumococcal polysaccharide vaccines.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001428:Bacterial Vaccines; D002648:Child; D002675:Child, Preschool; D002986:Clinical Trials as Topic; D004341:Drug Evaluation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011008:Pneumococcal Infections / Q000517:prevention & control*; D022242:Pneumococcal Vaccines; D011135:Polysaccharides, Bacterial; D012306:Risk; D013997:Time Factors; D014481:United States; D014611:Vaccination
chemical_list: D001428:Bacterial Vaccines; D022242:Pneumococcal Vaccines; D011135:Polysaccharides, Bacterial