Bacterial tracheitis and viral croup.
D001424:Bacterial Infections / Q000150:complications*; D002675:Child, Preschool; D003440:Croup / Q000150:complications*; D005260:Female; D006801:Humans; D007827:Laryngitis / Q000150:complications*; D014136:Tracheitis / Q000150:complications*; D014777:Virus Diseases / Q000150:complications*