Invasive Haemophilus influenzae infections: changing patterns.
D000818:Animals; D002675:Child, Preschool; D004739:England / Q000453:epidemiology; D004813:Epidemiology / Q000639:trends; D006192:Haemophilus Infections / Q000453:epidemiology* / Q000382:microbiology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D011159:Population Surveillance; D014777:Virus Diseases / Q000453:epidemiology; D014852:Wales / Q000453:epidemiology