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BioMed Research International
Volume 2016 (2016), Article ID 9170167, 4 pages
Research Article

First Report of Bovine Leukemia Virus Infection in Yaks (Bos mutus) in China

1College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin 130118, China
2State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu 730046, China
3General Station for Surveillance of Wildlife Diseases & Wildlife Borne Diseases, State Forestry Administration (SFA), Shenyang 110034, China

Received 28 February 2016; Revised 7 May 2016; Accepted 16 May 2016

Academic Editor: Leon Spicer

Copyright © 2016 Jian-Gang Ma et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Enzootic bovine leukosis (EBL) is a chronic lymphosarcoma disease of cattle caused by bovine leukemia virus (BLV). No information is available concerning the epidemiology of BLV infection in yaks (Bos mutus). One thousand five hundred and eighty-four serum samples from 610 black yaks and 974 white yaks from Gansu province, northwest China, were collected between April 2013 and March 2014 and tested for BLV antibodies using a commercially available ELISA kit. The overall BLV seroprevalence in yaks was 21.09% (334/1584), with 24.26% (148/610) black yaks and 19.10% (186/974) white yaks yielding positive results. Risk factor analysis indicated that with the exception of breed (OR = 1.36, 95% CI = 1.06–1.73, ), the age, region, gender, farm, and the numbers of pregnancies were not considered as risk factors for the presence of BLV in yaks included in this study. This is the first report of BLV infection in yaks in China, which provides information for controlling BLV infection in yaks.