Atypical croup and Chlamydia trachomatis.
D002675:Child, Preschool; D002690:Chlamydia Infections; D002692:Chlamydia trachomatis; D003440:Croup / Q000209:etiology*; D006801:Humans; D007827:Laryngitis / Q000209:etiology*; D008297:Male