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Table 2 Apparent flock seroprevalence and odds of B. ovis exposure for risk factors in Wyoming, USA

From: Seroprevalence and risk factors of Brucella ovis in domestic sheep in Wyoming, USA

Risk Factor N Seroprevalencea Odds Ratio (95% CI) P value
Regionb
 Southeast 17 5.9% (1/17) Reference
 Northwest 25 12.0% (3/25) 1.99 (0.21 to 60.81) 0.575
 Northeast 20 25.0% (5/20) 4.67 (0.62 to 134.15) 0.294
 West 6 16.7% (1/6) 3.01 (0.069 to 131.62) 0.575
 South-central 14 57.1% (8/14) 17.34 (2.39 to 502.01) 0.012
Flock Sizeb
 Small 24 4.2% (1/24) Reference
 Very Small 20 10.0% (2/20) 2.36 (0.18 to 78.42) 0.516
 Medium 32 31.3% (10/32) 9.06 (1.51 to 237.89) 0.018
 Large 6 83.3% (5/6) 69.00 (5.81 to > 999.99) < 0.001
Ewe-to-ram Ratio
 Medium 9 44.4% (4/9) Reference
 Low 4 25.0% (1/4) 0.47 (0.01 to 6.07) 0.587
 High 4 75.0% (3/4) 3.21 (0.254 to 116.89) 0.587
Purchase of Outside Sheep
 No 7 28.6% (2/7) Reference
 Yes 9 55.6% (5/9) 2.83 (0.35 to 32.03) 0.340
  1. aParenthesis indicate proportion of seropositive flocks per category
  2. bIndicates significant difference between seroprevalence by Fisher’s exact test at p < 0.05