Pneumococcal vaccine.
D001428:Bacterial Vaccines; D006801:Humans; D008875:Middle Aged; D022242:Pneumococcal Vaccines; D011018:Pneumonia, Pneumococcal / Q000517:prevention & control; D012107:Research Design; D013296:Streptococcus pneumoniae / Q000276:immunology*; D014611:Vaccination / Q000592:standards
D001428:Bacterial Vaccines; D022242:Pneumococcal Vaccines