Changing incidence of Hemophilus influenzae meningitis.
D000367:Age Factors; D000818:Animals; D002673:Child, Hospitalized; D002675:Child, Preschool; D006193:Haemophilus influenzae; D006801:Humans; D007223:Infant; D008583:Meningitis, Haemophilus / Q000453:epidemiology*; D009820:Ohio