Table 2 Antibody titers of Chlamydia abortus infection in white yaks in Tianzhu Tibetan Autonomous County, China determined by indirect haemagglutination (IHA) test
From: Seroprevalence and risk factors of Chlamydia abortus infection in free-ranging white yaks in China
| Biometric data | Category | Antibody titers | No. positive | No. tested | Prevalence (%) | ||||
|---|---|---|---|---|---|---|---|---|---|
| 1:16 | 1:32 | 1:64 | 1:128 | 1:256 | |||||
| Region | Zhuaxixiulong | 10 | 7 | 2 | 1 | 1 | 21 | 73 | 28.77 |
| Xidatan | 83 | 36 | 14 | 3 | 1 | 137 | 901 | 15.21 | |
| Sex | Male | 24 | 18 | 7 | 1 | 0 | 50 | 289 | 17.30 |
| Female | 69 | 25 | 9 | 3 | 2 | 108 | 685 | 15.78 | |
| Age (years) | ≤ 1 | 11 | 1 | 2 | 0 | 0 | 14 | 115 | 12.17 |
| 1 < yr ≤ 2 | 22 | 2 | 3 | 0 | 0 | 27 | 180 | 15.00 | |
| 2 < yr ≤ 3 | 15 | 15 | 5 | 1 | 0 | 36 | 175 | 20.57 | |
| yr > 3 | 45 | 25 | 6 | 3 | 2 | 81 | 504 | 16.07 | |
| Season | Spring | 18 | 3 | 3 | 0 | 0 | 24 | 220 | 10.91 |
| Autumn | 17 | 8 | 1 | 0 | 0 | 26 | 231 | 11.26 | |
| Winter | 27 | 6 | 6 | 0 | 1 | 40 | 250 | 16.00 | |
| Summer | 31 | 26 | 6 | 4 | 1 | 68 | 273 | 24.91 | |
| Total | 93 | 43 | 16 | 4 | 2 | 158 | 974 | 16.22 | |