Contagious and zoonotic bacterial infection caused by Salmonella spp, of which there are >2500 serotypes. Clinically normal horses can transiently shed Salmonella, with shedding more common during:
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Concurrent illness: antibacterial usage, physiological disturbance
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Stress: transportation, social, nutritional
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Gastrointestinal disturbance: motility (especially colic), feed change