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Journal of Clinical Microbiology, 11 1997, 2904-2907, Vol 35, No. 11
Copyright © 1997 by the American Society for Microbiology. All rights reserved.

An outbreak of listeriosis suspected to have been caused by rainbow trout [In Process Citation]

H Ericsson, A Eklow, ML Danielsson-Tham, S Loncarevic, LO Mentzing, I Persson, H Unnerstad and W Tham
Department of Food Hygiene, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala. Henrik.Ericsson@lmhyg.slu.se

An outbreak of listeriosis in Sweden, consisting of nine cases, was investigated by means of molecular typing of strains from patients and strains isolated from suspected foodstuffs, together with interviews of the patients. Listeria monocytogenes was isolated from six of the patients, and all isolates were of the same clonal type. This clonal type was also isolated from a "gravad" rainbow trout, made by producer Y, found in the refrigerator of one of the patients. Unopened packages obtained from producer Y were also found to contain the same clonal type of L. monocytogenes. Based on the interview results and the bacteriological typing, we suspect that at least six of the nine cases were caused by gravad or cold-smoked rainbow trout made by producer Y. To our knowledge, this is the first rainbow trout-borne outbreak of listeriosis ever reported.

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