Salmonellosis in an adult dairy cow

An outbreak of diarrhoea occurred in a Jersey herd after the introduction of new stock. One of the cows was examined and treated unsuccessfully. Clinical findings included depression, fever, dehydration, congestion, signs of colic and a severe diarrhoea. The post mortem examination revealed emaciation, pseudomembranous enteritis, mesenteric lymphadenopathy and focal disseminated hepatic necrosis. Salmonella typhimurium was isolated from the faeces, mesenteric lymph nodes and liver.