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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