An outbreak of eosinophilic bronchitis in horses possibly associated with Dictyocaulus arnfieldi infection.
Eight mature horses which had been affected with a moist cough for six weeks were found to have large numbers of eosinophils in tracheal mucus samples taken by transtracheal washing. These horses were kept on irrigated pasture and fed a hay-free diet. A companion yearling donkey was found to be passing Dictyocaulus arnfieldi larvae in its faeces. Two oral treatments with a dose of thiabendazole (440 mg/kg) resulted in the resolution of the clinical signs and the disappearance of eosinophils from transtracheal washings. The eosinophilic bronchitis seen in these horses was presumed to be a manifestation of prepatent D arnfieldi infestation.
D000818:Animals; D001991:Bronchitis / Q000209:etiology / Q000473:pathology / Q000662:veterinary*; D004022:Dictyocaulus Infections / Q000150:complications* / Q000473:pathology; D004804:Eosinophils / Q000473:pathology; D006734:Horse Diseases / Q000209:etiology* / Q000473:pathology; D006736:Horses; D010527:Perissodactyla; D014132:Trachea / Q000473:pathology