Tuyển tập các báo cáo nghiên cứu về bệnh học thý y được đăng trên tạp chí Acta Veterinaria Scandinavica cung cấp cho các bạn kiến thức về bệnh thú y đề tài: Genetic surveillance of endemic bovine Salmonella Infantis infection. | Acta Veterinaria Scandinavica BioMed Central Research Genetic surveillance of endemic bovine Salmonella Infantis infection Nanna Lindqvist and Sinikka Pelkonen Open Access Address Kuopio Research Unit Department of Animal Diseases and Food Safety Research Evira Finnish Food Safety Authority Kuopio Finland Email Nanna Lindqvist - Sinikka Pelkonen - Corresponding author Published II May 2007 Received 19 December 2006 Acta Veterinaria Scandinavian 2007 49 15 doi 1751-0147-49-15 Accepted 1 1 May 2007 This article is available from http content 49 1 15 2007 Lindqvist and Pelkonen licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background Salmonella serovar Infantis is endemic in Finnish food-producing animals since the 1970s. The purpose of this study was to describe the molecular epidemiology of the infection in cattle during 1985-2005 to follow the persistence of the feed-related outbreak strain from 1995 in the cattle population and to analyse the stability of XbaI-banding patterns in individual herds during long-lasting infections. Methods Salmonella Infantis isolates from 478 cattle herds n 588 covering 73 of the subclinically or clinically infected herds were typed by pulsed-field gel electrophoresis PFGE using Xbal. DNA fragments larger than 125 kb were counted in PFGE types because of high plasmid background. Ribotyping and IS200-typing with BanI-digested DNA were done on 57 selected isolates. Results The isolates associated with the infection consisted of 51 PFGE types with genetic similarity F value between and . From 1985 to 2003 the major type appeared on 68 of the farms. The three most common types with F values of .
