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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