Roundworm: cause of tracheal stricture.
D000818:Animals; D001715:Bird Diseases / Q000209:etiology*; D002171:Canaries; D008297:Male; D009349:Nematode Infections / Q000150:complications / Q000662:veterinary*; D014135:Tracheal Stenosis / Q000209:etiology / Q000662:veterinary*