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Prevalence of Campylobacter jejuni in ranch mink at pelting: Cultural, serological, and histological evidence of infection.

This survey of 500 mink on three Wisconsin ranches at pelting gives an estimate of the prevalence of Campylobacter jejuni in the feces of clinically normal animals. On ranches 1 and 2, which used wet feed, C. jejuni was isolated by colon content culture from 7% and 32% of mink one year, and 43% and 13% the next year; the 200 bile samples tested were culture-negative. On ranch 3, which fed a pelleted ration, the organism was never isolated. Among culture-positive mink tested, 22 of 55 had bacterial agglutination serum titers to homologous and/or heterologous Campylobacter isolates from the ranch of origin. Four of 23 culture-negative animals tested had titers. No histological evidence of inflammatory changes in the lower ileum and/or colon was found, although Campylobacter-like organisms were rarely seen in silver-stained sections from both culture-negative and culture-positive animals. We conclude that the presence of C. jejuni in the mink gut does not necessarily indicate a role in gastrointestinal disease.