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Báo cáo khoa học: "Salmonella dublin in Danish Dairy Herds: Frequency of Change to Positive Serological Status in Bulk Tank Milk ELISA in Relation to Serostatus of Neighbouring Farm"

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: Salmonella dublin in Danish Dairy Herds: Frequency of Change to Positive Serological Status in Bulk Tank Milk ELISA in Relation to Serostatus of Neighbouring Farms. | Acta vet. scand. 2001 42 295-302. Salmonella dublin in Danish Dairy Herds Frequency of Change to Positive Serological Status in Bulk Tank Milk ELISA in Relation to Serostatus of Neighbouring Farms By A. Wedderkopp1 U. Strager2 and P Lind3 1Cattle Health Laboratory Danish Dairy Board Brorup 2Danish Dairy Board Ẳrhus and 3Danish Veterinary Laboratory Copenhagen Denmark. Wedderkopp A Stroger U Lind P Salmonella dublin in Danish dairy herds Frequency of change to positive serological status in bulk tank milk ELISA in relation to serostatus of neighbouring farms. Acta vet. scand. 2001 42 295-302. - Bulk tank milk from 1 429 herds were collected in 3 rounds from 19 different geographic areas. The milk samples were tested by use of indirect LPS-ELISA procedure to detect Salmonella dublin antibodies. From the obtained OD-values herd seroprevalence in the given area was determined and GR-scores calculated for each herd by addition of the number of positive sampling rounds by the 5 geographically closest neighbour herds. In the 19 different areas the calculated prevalence ranged from 0.01 to 0.41. Totally 3 697 GR-scores were given. The mean GR-scores in the areas ranged from 0.0 to 6.5. Higher GR-scores were found in herds changing to seropositive status compared with herds seronegative throughout the study period. The results indicate that the risk for a dairy herd to receive S. dublin infection increases with the disease status among the nearest neighbours and with the prevalence of seropositive herds in the geographic area. Salmonella dublin cattle dairy herds milk samples LPS-ELISA epidemiology seroprevalence risk. Introduction Salmonella dublin is a host-adapted serotype causing infection in cattle of all ages Richardson 1975 . It has been isolated from cattle in all parts of the world Walker 1995 . In Denmark this serotype has been isolated in 60 -75 of all diagnosed Salmonella outbreaks in cattle since 1980 Annual Report Danish Veterinary Laboratory 1989-1995 . S. .