title: [Preventive effectiveness of an urgent mass vaccination with purified meningococcal polysaccharide vaccine observed during a meningitis epidemic].
mesh_terms: D000293:Adolescent; D001428:Bacterial Vaccines / Q000008:administration & dosage / Q000276:immunology*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D008585:Meningitis, Meningococcal / Q000517:prevention & control*; D009345:Neisseria meningitidis / Q000276:immunology*; D011135:Polysaccharides, Bacterial / Q000276:immunology
chemical_list: D001428:Bacterial Vaccines; D011135:Polysaccharides, Bacterial