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The aim of the study was to detect the distribution of presumptive pathogenic Yersinia spec1es in {5 pigs of Latvian origm. In total tonsils of 108 pigs were collected from 6 farms m two abattoirs @ Situated m different parts of Latvia. Samples were investigated by using direct plating on the != selective CIN media and cold enrichment technique for 2 weeks. All presumptive isolates were confirmed biochemically. During the direct plating only 58% of cultures of Y.enterocolitica and 4 Y.pseudotuberculosts were recovered. Y. enterocolitica was isolated from the pig tons1l samples orig1nated from all s1x farms The distribution of positive samples among different farms varied from 15 to 45%. Y.pseudotuberculosis was recovered from 3 out of 6 herds studied rangmg from 5 to 25% on each positive farm. The mean prevalence of Y.enterocolitica and Y.pseudotuberculosis in all SIX farms was 31% and 8% respectively Results of study indicate that none of the investigated herds was free of potentially pathogenic Yersinia. The presence of Yersinia species in pigs mdicates that a possibility for contamination with bacteria occurs during the offal removal of and meat mspection of carcasses. Further Investigations on pathogenic properties and slaughtenng techniques at the slaughterhouses involved m this study should be continued.

A pilot study on occurrence of Yersinia enterocolitica and Yersinia pseudotuberculosis in Latvian pigs at slaughtering