A number of bacterial pathogens are frequently implicated as causes of diarrhoea in horses including,
Infection with Salmonella can result from consumption of contaminated feed or water or contact with carrier animals which shed the bacterium in their faeces. Horses of any age may be affected. Signs of Salmonella infection in horses can range from inapparent infection to severe septic shock and sudden death. Most horses will present with an increased body temperature and diarrhoea. Salmonella from any animal, including horses, can infect humans, so good hygiene practices should be observed when handling any horse with diarrhoea.
Other bacterial species which are less frequently identified in cases of diarrhoea include, Campylobacter sp., Aeromonas sp. and Enterococcus durans.