title: Effect of Neisseria meningitidis group A polysaccharide vaccine on nasopharyngeal carrier rates.
mesh_terms: D001428:Bacterial Vaccines; D002353:Carrier State / Q000382:microbiology*; D004196:Disease Outbreaks; D005387:Finland; D006801:Humans; D008297:Male; D008585:Meningitis, Meningococcal / Q000453:epidemiology / Q000382:microbiology / Q000517:prevention & control*; D008887:Military Medicine; D009305:Nasopharynx / Q000382:microbiology; D009345:Neisseria meningitidis / Q000276:immunology* / Q000302:isolation & purification; D011135:Polysaccharides, Bacterial / Q000276:immunology*
chemical_list: D001428:Bacterial Vaccines; D011135:Polysaccharides, Bacterial