tailieunhanh - Báo cáo khoa học: "Anaplasma phagocytophilum Infection in North Norway. The First Laboratory Confirmed Case"

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 y đề tài: Anaplasma phagocytophilum Infection in North Norway. The First Laboratory Confirmed Case. | Acta vet. scand. 2005 46 167-171. Brief Communication Anaplasma phagocytophilum Infection in North Norway. The First Laboratory Confirmed Case By S. Stuen1 A. Solli Oppegaard2 K. Bergstrom3 and T. Moum1 Norwegian School of Veterinary Science Department of Production Animal Clinical Sciences Sandnes Norway 2Norwegian Food Safety Authority Sor-Helgeland Bronnoysund Norway 3National Veterinary Institute Department of Bacteriology Uppsala Sweden Tick-borne fever TBF caused by the bacterium Anaplasma phagocytophilum formerly Ehrlichia phagocy tophila and transmitted by the tick Ixodes ricinus is a common disease in domestic ruminants on the west coast of southern Norway Stuen 1997 . TBF in cattle and sheep is characterized by high fever reduced milk yield inclusions in circulating neutrophils leucopenia abortions and reduced fertility. In cattle the incubation period after experimental inoculation is 4-9 days and the fever period may last for 1-13 days Pusterla et al. 1997 Brun-Hansen et al. 1998 . A. phagocy-tophilum infection normally gives mild to moderate clinical signs but serious complications including deaths have been observed Tuomi 1966 Pusterla Braun 1997 . Clinical signs in cattle may include depression decreased appetite coughing nasal discharge respiratory signs swelling of the hind limbs and stiff gate Pusterla et al. 1997 Brun-Hansen et al. 1998 . However the most serious problem associated with TBF especially in sheep is the following immunosuppresion which may predispose to secondary infections Woldehiwet Scott 1993 . The infection can therefore cause severe lamb losses on tick pasture 0verảs et al. 1985 . In addition indirect losses such as reduced growth rate have been observed in both young cattle and lambs infected with A. phago-cytophilum Taylor Kenny 1980 Stuen et al. 2002a . Serological analysis in sheep and wild cervids from southern Norway indicate that A. phago-cytophilum infection is abundant on tick-infested pasture Stuen Bergstrom 2001 .