title: Letter: suppression of reactivity to bovine PPD tuberculin in cattle tested in both caudal folds: a possible sourceof error in tuberculin trials.
mesh_terms: D000818:Animals; D002417:Cattle; D012885:Skinfold Thickness; D014373:Tuberculin / Q000008:administration & dosage*; D014374:Tuberculin Test / Q000662:veterinary*; D014380:Tuberculosis, Bovine / Q000175:diagnosis*
chemical_list: D014373:Tuberculin