Meningococcal polysaccharide vaccines.
D001428:Bacterial Vaccines / Q000627:therapeutic use*; D004196:Disease Outbreaks / Q000517:prevention & control; D006801:Humans; D009345:Neisseria meningitidis / Q000276:immunology*; D011135:Polysaccharides, Bacterial / Q000276:immunology*; D014481:United States