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: An Unusual Congenital Malformation in a Calf with Serological Evidence of Foetal Bovine Viral Diarrhoea Virus Infection. | Acta vet. scand. 2001 42 425-428. Brief Communication An Unusual Congenital Malformation in a Calf with Serological Evidence of Foetal Bovine Viral Diarrhoea Virus Infection By I. Yeruham1 M. Michael2 and 5. Perl3 1 Hachaklait Gedera and The Koret School of Veterinary Medicine the Hebrew University of Jerusalem Rehovot 2 Hachaklait Yavne 3The Kimron Veterinary Institute Bet Dagan and The Koret School of Veterinary Medicine the Hebrew University of Jerusalem Rehovot Israel. Bovine viral diarrhoea BVD virus is maintained in the environment by persistently infected animals Derget Loewen 1995 . The BVD virus in an immunocompetent pregnant animal is capable of crossing the placental barrier and invading the foetus Kahrs 1973 Done et al. 1980 . The principal determinant of foetal response to infection is the age of the foetus at the time of infection Baker 1987 and the differing ability of different strains of BVD virus to produce congenital defects Hafez et al. 1976 Sanders et al. 1983 . Breed variation and immune status of the host may also be important factors in determining the foetal effect. The possible outcomes of foetal infection include foetal resorption abortion mummification congenital malformations birth of weak and undersized calves birth of calves persistently infected with BVD virus and birth of normal calves. Foetopathology caused by BVD virus infection during the first trimester has been well documented Kahrs et al. 1970 Casaro et al. 1971 Scott et al. 1973 Brown et al. 1974 1975 Done et al. 1980 Van Oirschot 1983 Binkhorst et al. 1983 Wilson et al. 1983 Ohmann 1984 Roeder et al. 1986 . The following congenital defects have been described cerebellar hypoplasia hydrocephalus hydra-nencephaly with or without cranial deformation dysmyelination of the spinal cord lenticular cataracts microphthalmos chorioretinopathy alopecia brachygnathia intrauterine growth retardation and thymus hypoplasia. This report describes an unusual congenital malformation in a calf
