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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: A Long-Term Study of Neospora caninum Infection in a Swedish Dairy Herd. | Acta vet. scand. 2003 44 63-71. A Long-Term Study of Neospora caninum Infection in a Swedish Dairy Herd By Susanne Stenlund12 Hans Kindahĩ1 Arvid Uggla2 and Camilla Bjorkman2 department of Obstetrics and Gynaecology Centre of Reproductive Biology in Uppsala and department of Ruminant Medicine and Veterinary Epidemiology Swedish University of Agricultural Sciences and department of Parasitology SWEPAR National Veterinary Institute and Swedish University of Agricultural Sciences Uppsala Sweden. Stenlund S Kindahl H Uggla A Bjorkman C A long-term study of Neospora caninum infection in a Swedish dairy her. Acta vet. scand. 2003 44 63-71. - A longitudinal study was performed in a Swedish dairy herd where Neospora caninum had been isolated from a stillborn calf. Starting in autumn 1994 blood samples from all female animals in the herd were collected once yearly until 1999. The sera were analysed for presence of IgG1 antibodies to N. caninum by the iscom ELISA and by an avidity ELISA to establish the timing of infection. In addition data on reproductive performance were compiled. During the study the percentage of seropositive female animals increased from 63 to 87 . In 1994 a large number of young animals tested seropositive although their dams were seronegative indicating that a transmission of the parasite other than the vertical had recently occurred. Low avidity values supported this assumption. The annual abortion rate increased from a mean of 2 before the initiation of the study to 9 in 1994-1998. During the same time as judged by the avidity data a large proportion of the animals shifted from being recently to being chronically infected. The source of the external infection in the herd could not be identified. Neospora caninum parasite cattle transmission abortion antibodies IgG avidity. Introduction Neospora caninum is a cyst-forming coccidian parasite which may infect several mammalian species although it is clinically most important in cattle where it can cause
