Croup.
D002648:Child; D002675:Child, Preschool; D003440:Croup / Q000209:etiology* / Q000628:therapy; D004165:Diphtheria / Q000175:diagnosis; D006801:Humans; D007223:Infant; D007827:Laryngitis / Q000209:etiology*; D012141:Respiratory Tract Infections / Q000382:microbiology; D013035:Spasm / Q000175:diagnosis; D014136:Tracheitis / Q000382:microbiology