The lesions in the small intestine of this calf comprised mild enterocyte exfoliation and slight stunting and fusion of villi, which could have been caused by Newbury agent (Hall et al 1984) , and infiltration of Salmonella typhimurium S typhimurium was detected in three calves by either faecal or mucosal examination, by both methods in two calves and by faecal examination alone in one.