title: Pneumococcal vaccine failure.
mesh_terms: D000368:Aged; D001428:Bacterial Vaccines; D006801:Humans; D008297:Male; D011008:Pneumococcal Infections / Q000517:prevention & control*; D013296:Streptococcus pneumoniae / Q000276:immunology*; D014611:Vaccination
chemical_list: D001428:Bacterial Vaccines