tailieunhanh - Báo cáo khoa học: "Verotoxinogenic Escherichia coli (VTEC) O157:H7 A Nationwide Swedish Survey of Bovine Faeces"

Tuyển tập các báo cáo nghiên cứu về bệnh thú y được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành thú y đề tài: Verotoxinogenic Escherichia coli (VTEC) O157:H7 A Nationwide Swedish Survey of Bovine Faeces. | Acta vet. scand. 2003 44 43-52. Verotoxinogenic Escherichia coli VTEC O157 H7 -A Nationwide Swedish Survey of Bovine Faeces By A. Albihn1 E. Eriksson2 C. Wallen3 and A. Aspán2 Department of Disease Control and Biosecurity 2Department of Bacteriology 3Department of Antibiotics National Veterinary Institute Uppsala Sweden Albihn A Eriksson E Wallen C Aspán A Verotoxinogenic Escherichia coli VTEC O157 H7 - A nationwide Swedish survey of bovine faeces. Acta vet. scand. 2003 44 43-52. - In the autumn of 1995 the first outbreaks of enterohemorrhagic Escherichia coli O157 H7 including ca 100 human cases were reported in Sweden. From outbreaks in other countries it is known that cattle may carry these bacteria and in many cases is the source of infection. Therefore the present study was performed to survey the Swedish bovine population for the presence of verotoxin-producing E. coli VTEC of serotype O157 H7. Individual faecal samples were collected at the 16 main Swedish abattoirs from April 1996 to August 1997. Of 3071 faecal samples VTEC O157 were found in 37 samples indicating a prevalence of CI95 . All 37 isolates carried genes encoding for verotoxin VT1 and or VT2 intimin EHEC-haemolysin and flagellin H7 as determined by PCR. Another 3 strains were of serotype O157 H7 but did not produce verotoxins. The 37 VTEC O157 H7 strains were further characterised by phage typing and pulsed-field gel electrophoresis. The results clearly show that VTEC O157 H7 is established in the Swedish bovine population and indicate that the prevalence of cattle carrying VTEC O157 H7 is correlated to the overall geographical distribution of cattle in Sweden. Results of this study have formed the basis for specific measures recommended to Swedish cattle farmers and furthermore a permanent monitoring programme was launched for VTEC O157 H7 in Swedish cattle at slaughter. between phage typing PFGE. Introduction The first case of enterohemorrhagic colitis due to infection with .