title: A reassessment of pneumococcal vaccine.
mesh_terms: D000368:Aged; D001428:Bacterial Vaccines / Q000276:immunology*; D002986:Clinical Trials as Topic; D006801:Humans; D008875:Middle Aged; D011008:Pneumococcal Infections / Q000517:prevention & control*; D011014:Pneumonia / Q000517:prevention & control; D011897:Random Allocation; D018805:Sepsis / Q000517:prevention & control; D013296:Streptococcus pneumoniae / Q000276:immunology*
chemical_list: D001428:Bacterial Vaccines