Fig. 1
From: Genotyping bovine leukemia virus in dairy cattle of Heilongjiang, northeastern China
Map of dairy cattle distribution in China and HLJ Province territory. a Current dairy cattle distribution in China. Colors from light to dark indicate that the amounts of cattle gradually increased. Cattle amounts in the darkest region were more than 200,000, as in HLJ. b The map of HLJ Province territory. We collected samples from six major regions of HLJ. Each region is indicated with a black dot from left to right. Harbin is the capital of HLJ Province. Colors from light to dark indicate that the infection rate gradually increased. QQHR, Qiqihar; DQ, Daqing; SH, Suihua; HRB, Harbin; MDJ, Mudanjiang; JX, Jixi; and ND, not determined