Abstract
Swine faeces from three pig farms in the La Crosse River watershed near La Crosse, Wisconsin, were sampled for Yersinia enterocolitica; 19 presumptive isolates were recovered and biochemically confirmed as Y. enterocolitica. Simultaneously, during a 2.2 cm rainfall, the confluences of runoff water flowing from the swine holding pens and of nearby streams were also 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 of Y. enterocolitica into water supplies; faecal material from swine, a suspected natural reservoir of the bacterium, is transported via runoff water to streams.
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