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: Description of the Infection Status in a Norwegian Cattle Herd Naturally Infected by Mycobacterium avium subsp. paratuberculosis. | Acta vet. scand. 2005 46 45-56. Description of the Infection Status in a Norwegian Cattle Herd Naturally Infected by Mycobacterium avium subsp. paratuberculosis By G. Halstad1 Ó. G. Sigurỗardóttir1 A. K. Storset2 J. Tharaldsen1 O. Nyberg1 J. Schonheit2 and B. Djanne1 National Veterinary Institute . Box 8156 Dep. N-0033 Oslo Norway 2National Veterinary Institute Bon-telabo 8 5003 Bergen Norway 3Norwegian School of Veterinary Science . Box 8146 Dep. N-0033 Oslo Norway. Gudmund H Sigurỗardóttir OG Storset AK Tharaldsen J Nyberg O Schonheit J. Djonne B Description of the infection status in a Norwegian cattle herd naturally infected by Mycobacterium avium subsp. paratuberculosis. Acta vet. scand. 2005 46 45-56. - The Norwegian surveillance and control programme for paratuberculosis revealed 8 seroreactors in a single dairy cattle herd that had no clinical signs of Mycobacterium avium subsp. paratuberculosis M. a. paratuberculosis infection. Paratuberculosis had been a clinical problem in goats several years previously in this herd. All 45 cattle were culled and a thorough investigation of the infection status was conducted by the use of interferon-Y IFN-y immunoassay measurement of antibodies and pathological and bacteriological examination. In the IFN-y immunoassay 9 animals gave positive results and 13 were weakly positive while 19 animals were negative. In the serological test 10 animals showed positive reactions and 5 were doubtful while 30 animals gave negative reactions. There appeared to be a weak trend toward younger animals having raised IFN-y and older animals having raised serological tests. Histopathological lesions compatible with paratuberculosis were diagnosed in 4 animals aged between 4 and 9 years. Three of these animals had positive serological reaction and one animal gave also positive results in the IFN-y immunoassay. Infection was confirmed by isolation of M. a. paratuberculosis from 2 of these 4 animals. One single bacterial isolate examined
