tailieunhanh - Báo cáo thú y: "Direct and indirect transmission of four Salmonella enterica serotypes in pigs"

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 yđề tài: Direct and indirect transmission of four Salmonella enterica serotypes in pigs. | Osterberg et al. Acta Veterinaria Scandinavica 2010 52 30 http content 52 1 30 AVS ACTAVETERINARIA Scatand n SCANDINAVICA RESEARCH Open Access Direct and indirect transmission of four Salmonella enterica serotypes in pigs Julia Osterberg 1 2 Susanna Sternberg Lewerin1 and Per Wallgren1 2 Abstract Background Feed-borne spread of Salmonella spp. to pigs has been documented several times in recent years in Sweden. Experiences from the field suggest that feed-associated serotypes might be less transmittable and subsequently easier to eradicate from pig herds than other serotypes more commonly associated to pigs. Four Salmonella serotypes were selected for experimental studies in pigs in order to study transmissibility and compare possible differences between feed-assoociated S Cubana and S Yoruba and pig-associated serotypes S Derby and S Typhimurium . Methods Direct contact transmission was studied in four groups of pigs formed by six 10-week-old salmonella negative pigs commingled with two fatteners excreting one of the four salmonella serotypes. Indirect transmission was studied by putting six 10-week-old salmonella negative pigs in each of four salmonella contaminated rooms. Each room had previously housed a group of pigs excreting one of the four selected serotypes. All pigs were monitored for two weeks with respect to the faecal excretion of salmonella and the presence of serum antibodies. At the end of the trial eight samples from inner tissues and organs were collected from each pig at necropsy. Results In the four direct transmission groups one pig shed Salmonella Cubana at one occasion. At necropsy S Typhimurium was isolated from one pig. In the indirect transmission groups two pigs in the Yoruba room and one pig in each of the other rooms were excreting detectable levels of Salmonella once during the study period of two weeks. At necropsy S Derby was isolated from one of six pigs in the Derby room and S Typhimurium was isolated from four

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