Research Article
First Report of Bovine Leukemia Virus Infection in Yaks (Bos mutus) in China
Table 1
Seroprevalence of bovine leukemia virus (BLV) infection in yaks in Gansu province, northwestern China, by enzyme-linked immunosorbent assay (ELISA).
| Factor | Category | No. tested | No. positive | Prevalence (%) |
| Gender | Male | 471 | 112 | 23.78 | Female | 1113 | 222 | 19.95 |
| Age (years) | 0 < years ≤ 1 | 286 | 57 | 19.93 | 1 < years ≤ 3 | 594 | 123 | 20.71 | 3 < years ≤ 5 | 355 | 89 | 25.07 | 5 < years | 349 | 65 | 18.63 |
| Pregnancy | ≤2 | 854 | 171 | 20.02 | 3–5 | 189 | 38 | 20.11 | ≥6 | 70 | 13 | 18.57 |
| Season | Spring | 428 | 99 | 23.13 | Summer | 354 | 70 | 19.77 | Autumn | 467 | 105 | 22.48 | Winter | 335 | 60 | 17.91 |
| Species | White yaks | 974 | 186 | 19.10 | Black yaks | 610 | 148 | 24.26 |
| Region | Tianzhu | 974 | 186 | 19.10 | Luqu | 146 | 33 | 22.60 | Maqu | 464 | 115 | 24.78 |
| Total | | 1584 | 334 | 21.09 |
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