Prevalence of pathogenic Yersinia spp. on by-products, carcasses and tonsils | Patogēno jersīniju sugu (Yersinia spp.) sastopamība cūku blakusproduktos, liemeņos un mandelēs
2008
Terentjeva, M., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Veterinary Medicine. Inst. of Food and Environmental Hygiene | Berzins, A., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Veterinary Medicine. Inst. of Food and Environmental Hygiene | Liepins, E., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Veterinary Medicine. Inst. of Food and Environmental Hygiene
The prevalence of pathogenic Yersinia was studied from July to October 2007. A total of 105 pig tonsils, 105 by-products and 30 carcass swabs were collected at a large scale slaughterhouse. Samples of tonsils and by-products were obtained from the pluck sets in postmortem inspection area. Samples were tested according to the method of the International Organization of Standardization (Anonymous, 2003). Cold-enrichment was carried out for two weeks if no positive samples were found during the first week of incubation. Overall, 54% of tonsils were tested positive for Yersinia spp., where Y. enterocolitica 4/O:3 and Y. pseudotuberculosis, accounted for 50% and 4%, respectively. Both Yersinia species were recovered from by-products (48%), while Y.enterocolitica (23%) only from carcasses. The prevalence of Yersinia on by-products was significantly higher in tongues and liver than in other parts of the pluck set (p is less than 0.05). High prevalence of Yersiniae on by-products and carcasses may present concerns for public health. The results of this study indicate that possibilities of Yersinia contamination of by-products and carcasses may occur during pig slaughtering from Yersinia positive tonsils. Further studies are needed to find the main sources of contamination at slaughter.
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