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: Persistence of Ehrlichia phagocytophila Infection in Two Age Groups of Lambs. | Acta vet. scand. 2001 42 453-458. Persistence of Ehrlichia phagocytophila Infection in Two Age Groups of Lambs By 5. Stuen1 and K. Bergstrom2 Norwegian School of Veterinary Science Department of Sheep and Goat Research Sandnes Norway and 2National Veterinary Institute Department of Bacteriology Uppsala Sweden. Stuen S Bergstrom K Persistence of Ehrlichia phagocytophila infection in two age groups of lambs. Acta vet. scand. 2001 42 453-458. - Tick-borne fever TBF is caused by the rickettsiae Ehrlichia phagocytophila and is a common disease in sheep in tick Ixodes ricinus infested areas in Norway. Earlier investigations have shown that some sheep could remain infected for several months after the primary infection. In this study the persistence of E. phagocytophila after experimental infection was investigated in 2 age groups of lambs. Six lambs 1-2 weeks old and 14 lambs 6-8 months old were inoculated intravenously with an ovine strain of E. phagocytophila and thereafter examined clinically including daily body temperature recording and by haematological and serological E. equi antibodies methods for the next 4 months. At the end of this period the lambs were examined for a TBF infection by blood smear investigation and blood inoculation studies. The infection was demonstrated in 19 95 of the 20 lambs. granulocytic Ehrlichia tick-borne fever sheep age. Introduction Tick-borne fever TBF caused by Ehrlichia phagocytophila and transmitted by the tick Ixodes ricinus is an old and very common disease in sheep from the coast of southern Norway Stuen 1997 1998 . This disease is characterized by high fever inclusions in circulating neutrophils reduced milk yield abortion and reduced fertility in rams Woldehiwet Scott 1993 . However the most serious problem associated with TBF in sheep is the immunosup-presion that may dispose to secondary infections such as Staphylocccous aureus pyaemia and Pasteurella hemolytica septicaemia Brodie et al. 1986 Stuen 1996 . Earlier studies .
