A note onYersinia enterocoliticain a swine farm watershed

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Abstract
Swine faeces from three pig farms in the La Crosse River watershed near La Crosse, Wisconsin, were sampled forYersinia enterocolitica; 19 presumptive isolates were recovered and biochemically confirmed asY. enterocolitica.Simultaneously, during a 2mD2 cm rainfall, the confluences of runoff water flowing from the swine holding pens and of nearby streams also were sampled; a single isolate was obtained from one holding pen runoff‐stream confluence. Biochemical analysis showed that the water isolate was a biotype identical with that of a swine isolate from the adjacent farm. These results demonstrate one possible mechanism for the introduction ofY. enterocoliticainto water supplies; faecal material from swine, a suspected natural reservoir of the bacterium, is transported via runoff water to streams.