ウシハッケツビョウ マンエンノウジョウ ニオケル ウシメンエキフゼンウイルス ノ シンジュンジョウキョウ ; 牛白血病蔓延農場における牛免疫不全ウイルスの浸潤状況 ; Invasion status of bovine immunodeficiency virus on a bovine leukemia-infested farm

Bulletin ; We examined the invasion status of bovine immunodeficiency virus on a bovine leukemia virus-infested farm. The survey was conducted over 4 months during the period from April 2015 to August 2015, with a total of 407 head of cattle consisting of 284 on Hokkaido farm A, 31 on Hokkaido farm B, and 92 on one farm in Kyoto prefecture (farm C). The cows were tested and the BLV prevalence rates on the farms were found to be 36.3% for farm A, 0% for farm B, and 67.3% for farm C. The numbers of BIV-positive cattle were 1 on farm A (0.35%), 1 on farm B (3.23%), and 0 on farm C (0%), giving a total of 2 (0.49%) altogether. The one on farm A was positive for BLV antibodies, whereas the one on farm B was negative for them. Based on the above results, no epidemic of BIV was observed on the 3 farms. Nor was there was any relationship with BLV. In this study, although the positive rate for BIV was low, BIV infection was observed in both BLV-positive and -negative cattle Both BIV-positive cattle were home-produced cows, and the infection route is unknown. Therefore, BIV is considered to be one of the diseases to watch for in the future. ; departmental bulletin paper