Pneumococcal vaccine efficacy.
D001428:Bacterial Vaccines; D006801:Humans; D008586:Meningitis, Pneumococcal / Q000517:prevention & control*; D022242:Pneumococcal Vaccines; D013296:Streptococcus pneumoniae / Q000302:isolation & purification*
D001428:Bacterial Vaccines; D022242:Pneumococcal Vaccines