Meningitis vaccine approved for younger children.
D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D016920:Meningitis, Bacterial / Q000453:epidemiology / Q000517:prevention & control*; D022401:Meningococcal Vaccines / Q000008:administration & dosage*; D014481:United States / Q000453:epidemiology
D022401:Meningococcal Vaccines