Research Article
Seroprevalence and Risk Factors of Chlamydia abortus Infection in Tibetan Sheep in Gansu Province, Northwest China
Table 3
Seroprevalence of Chlamydia abortus infection in Tibetan sheep in Gansu, China, determined by indirect haemagglutination (IHA) test.
| Biometric data | Category | Antibody titers | Positive numbers | Tested numbers | Prevalence (%) | 1 : 16 | 1 : 32 | 1 : 64 | 1 : 128 | 1 : 256 | 1 : 512 | 1 : 1024 |
| Age (years) | ≤1 | 16 | 4 | 0 | 3 | 2 | 0 | 0 | 25 | 335 | 7.46 | 1 < yr ≤ 2 | 39 | 12 | 7 | 2 | 2 | 0 | 0 | 62 | 392 | 15.82 | 2 < yr ≤ 3 | 19 | 10 | 4 | 2 | 3 | 0 | 0 | 38 | 194 | 19.59 | yr > 3 | 114 | 46 | 23 | 7 | 5 | 2 | 1 | 198 | 811 | 24.41 | Region | Tianzhu County | 83 | 30 | 21 | 12 | 10 | 0 | 1 | 157 | 962 | 16.32 | Maqu County | 85 | 35 | 8 | 2 | 1 | 2 | 0 | 133 | 588 | 22.62 | Luqu County | 20 | 7 | 5 | 0 | 1 | 0 | 0 | 33 | 182 | 18.13 | Sex | Male | 76 | 24 | 9 | 2 | 2 | 1 | 0 | 114 | 530 | 21.51 | Female | 112 | 48 | 25 | 12 | 10 | 1 | 1 | 209 | 1202 | 17.39 | Season | Winter | 28 | 10 | 4 | 3 | 2 | 0 | 1 | 48 | 375 | 12.80 | Spring | 48 | 20 | 11 | 4 | 6 | 0 | 0 | 89 | 480 | 18.54 | Autumn | 62 | 22 | 8 | 5 | 1 | 0 | 0 | 98 | 479 | 20.46 | Summer | 50 | 20 | 11 | 2 | 3 | 2 | 0 | 88 | 398 | 22.11 | | Total | 188 | 72 | 34 | 14 | 12 | 2 | 1 | 323 | 1732 | 18.65 |
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