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Experimental Salmonella anatum infection in horses.

Salmonella anatum was given orally to 8 horses on 11 occasions in doses ranging from 9.5 X 10(6) to 8.8 X 10(11) organisms. Four distinct syndromes were induced based upon clinical, laboratory and pathological findings: (1) asymptomatic; (2) moderate clinical signs with or without changes in faecal consistency; (3) fever, depression, anorexia with unstructured or diarrhoeic faeces; and (4) septicaemia with or without diarrhoea, and peripheral circulatory failure. All animals excreted the organism. The peak temperature preceded the onset of diarrhoea by 1 or 2 days. Changes in faecal consistency were associated with direct isolation of the organism. The degree of neutropaenia increased with the dosage. Blood cultures were unsatisfactory, only 1 of 33 samples being positive. The serological responses were not significant although one animal displayed a significant seroconversion consistent with the clinical reaction. Indomethacin was not of value in moderating intestinal fluid secretion in one animal. The distribution and quantitation of positive cultures at autopsy closely reflected the type of syndrome induced. The invasiveness of the organism was confirmed by frequent direct recoveries from intestinal wall and draining lymph node samples. S. anatum appears to be of similar pathogenicity to S. typhimurium in the horse, at least under experimental conditions.