Subclinical and clinical infections with Salmonella are reasonably common in large animal patients [Dunowska; et al., 2004; Smith, et al., 2004; Morley, et al., 2004]. Major outbreaks of nosocomial Salmonella have been documented at large animal veterinary teaching hospitals over the past several decades [Castor, et al., 1989; Dargatz and Traub-Dargatz, 2004; Hartmann, 1996; Pare, et al., 1996; Schott, et al., 2001; Tillotson, et al., 1997] and have been responsible for a number of veterinary teaching hospital closures. Among equine patients, horses presenting with gastrointestinal disturbances such as diarrhea and colic may be at highest risk of shedding Salmonella [Ernst, et al., 2004; House, et al., 1999; Kim, et al., 2001; Morley, et al., 2004;Palmer, et al., 1985].
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