Skip to main content

Table 1 Apparent animal 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
Region
 Northeast 298 0.39% (1/255) Reference
 Northwest 255 1.68% (5/298) 3.90 (0.59 to 103.51) 0.346
 West 832 0.48% (4/832) 1.11 (0.15 to 30.48) 0.927
 South-central 572 1.57% (9/572) 3.60 (0.66 to 90.16) 0.346
 Southeast 466 0.64% (3/466) 1.51 (0.17 to 43.49) 0.927
Gender
 Rams 1477 0.95% (14/1477) Reference
 Ewes 946 0.85% (8/946) 0.90 (0.35 to 2.13) 0.812
Age Groupsb
 Lambs 147 0.00% (0/147)
 Yearlings 538 0.56% (3/538) Reference
 Adults 1337 0.60% (8/1337) 1.04 (0.29 to 5.02) 0.955
 Aged 220 2.27% (5/220) 4.06 (0.95 to 21.20) 0.118
Primary Breed Typeb
 Wool 1083 0.28% (3/1083) Reference
 Meat 402 1.24% (5/402) 4.44 (1.04 to 23.12) 0.044
 Multi-purpose 890 1.35% (12/890) 4.73 (1.48 to 21.79) 0.014
Time of Sample Collection
 After Breeding 754 0.53% (4/754) Reference
 Before Breeding 1669 1.08% (18/1669) 1.98 (0.73 to 7.06) 0.191
  1. aParenthesis indicate proportion of seropositive sheep per category
  2. bIndicates significant difference between seroprevalence by Fisher’s exact test at p <  0.05