title: [Immunizing reactivity following vaccination with a purified fraction of Neisseria meningitidis and observations of effectiveness throughout 3 years].
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001428:Bacterial Vaccines / Q000276:immunology*; D002648:Child; D002675:Child, Preschool; D002681:China; D006801:Humans; D007223:Infant; D008585:Meningitis, Meningococcal / Q000453:epidemiology / Q000276:immunology*; D013997:Time Factors; D014611:Vaccination
chemical_list: D001428:Bacterial Vaccines