tailieunhanh - Báo cáo khoa học: "Consequences of concurrent Ascaridia galli and Escherichia coli infections in chickens"

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: Consequences of concurrent Ascaridia galli and Escherichia coli infections in chickens. | Acta vet. scand. 2006 47 43-54. Consequences of concurrent Ascaridia galli and Escherichia coli infections in chickens By A. Permin1 J. P. Christensen1 M. Bisgaard1 1 Department of Veterinary Pathobiology The Royal Veterinary and Agricultural University Stigbojlen 4 1870 Frederiksberg C. Copenhagen Denmark. Permin A Christensen JP Bisgaard M. Consequences of concurrent Ascaridia galli and Escherichia coli infections in chickens. Acta vet. scand. 2006 47 43-53. - Three experiments were carried out to examine the consequences of concurrent infections with Ascaridia galli and Escherichia coli in chickens raised for table egg production. Characteristic pathological lesions including airsacculitis peritonitis and or polyserositis were seen in all groups infected with E. coli. Furthermore a trend for increased mortality rates was observed in groups infected with both organisms which however could not be confirmed statistically. The mean worm burden was significantly lower in combined infection groups compared to groups infected only with A. galli. It was also shown that combined infections of E. coli and A. galli had an added significant negative impact on weight gain. Ascaridia galli E. coli interactions free-range layer chickens Introduction Ascaridia galli and Escherichia coli are both common causes of infections in confined as well as in free-range poultry productions systems Dho-Moulin and Fairbrother 1999 Permin et al. 1999 . Pathogenic E. coli may cause airsacculitis salpingitis peritonitis polyserositis septicemia and other extra-intestinal diseases in chickens turkeys and other avian species. However E. coli also constitutes part of the intestinal microflora of healthy birds and most of the diseases associated with E. coli are considered secondary to environmental and host predisposing factors Dho-Moulin and Fairbrother 1999 . Clinical isolates of avian E. coli commonly belong to certain serogroups . O1 O2 and O78 and to a restricted number of clones White et