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Table 1 Canine vector-borne pathogen seroprevalence in Canada (2008–2015) for Borrelia burgdorferi, Ehrlichia and Anaplasma spp., and the antigen of Dirofilaria immitis (n = 753,468), and univariable associations between province and serostatus

From: Prevalence of Borrelia burgdorferi, Anaplasma spp., Ehrlichia spp. and Dirofilaria immitis in Canadian dogs, 2008 to 2015: a repeat cross-sectional study

Province B. burgdorferi Ehrlichia spp. Anaplasma spp. D. immitis
Ontario No. positive/No. tested (%) 10,186/564,552 (1.8) 2009/564,552 (0.4) 1719/564,476 (0.3) 703/564,552 (0.1)
Odds ratio Referent Referent Referent Referent
Alberta No. positive/No. tested (%) 54/6697 (0.8) 329/6697 (4.9) 98/6664 (1.5) 12/6,697 (0.2)
Odds ratio; P-value 0.4; P < 0.001 14.5; P < 0.001 4.9; P < 0.001 1.4; P = 0.2
British Columbia No. positive/No. tested (%) 23/4815 (0.5) 316/4815 (6.6) 133/4802 (2.8) 7/4815 (0.2)
Odds ratio; P-value 0.3; P < 0.001 19.7; P < 0.001 9.3; P < 0.001 1.2; P = 0.6
Manitoba No. positive/No. tested (%) 1718/72,254 (2.4) 211/72,254 (0.3) 695/72,158 (1.0) 250/72,254 (0.4)
Odds ratio; P-value 1.3; P < 0.001 0.8; P = 0.006 3.2; P < 0.001 2.8; P < 0.001
New Brunswick No. positive/No. tested (%) 158/2129 (7.4) 17/2129 (0.8) 18/2129 (0.9) 3/2129 (0.1)
Odds ratio; P-value 4.4; P < 0.001 2.3; P = 0.001 2.8; P < 0.001 1.1; P = 0.8
Newfoundland No. positive/No. tested (%) 6/236 (2.5) 3/236 (1.3) 1/236 (0.4) 1/236 (0.4)
Odds ratio; P-value 1.4; P = 0.4 3.6; P = 0.03 1.4; P = 0.7 3.4; P = 0.2
Nova Scotia No. positive/No. tested (%) 592/6464 (9.2) 37/6464 (0.6) 85/6429 (1.3) 12/6464 (0.2)
Odds ratio; P-value 5.5; P < 0.001 1.6; P = 0.004 4.4; P < 0.001 1.5; P = 0.2
Prince Edward Island No. positive/No. tested (%) 1/3 (33.3) 0/3 (0) 0/3 (0) 0/3 (0)
Odds ratio; P-value np np np np
Quebec No. positive/No. tested (%) 2229/95,898 (2.3) 582/95,898 (0.6) 363/95,891 (0.4) 274/95,898 (0.3)
Odds ratio; P-value 1.3; P < 0.001 1.7; P < 0.001 1.2; P < 0.001 2.3; P < 0.001
Saskatchewan No. positive/No. tested (%) 3/408 (0.7) 5/408 (1.2) 0/408 (0) 1/408 (0.3)
Odds ratio; P-value 0.4; P = 0.1 3.4; P = 0.006 np 2.0; P = 0.5
Yukon No. positive/No. tested (%) 0/12 (0) 1/12 (8.3) 0/12 (0) 0/12 (0)
Odds ratio; P-value np np np np
All of Canada No. positive/No. tested (%) 14,970/753,468 (2.0) 3510/753,468 (0.5) 3112/753,208 (0.4) 1263/753,468 (0.2)
  1. Notes: Reported values are test results not individual dogs. Odds ratio and associated P-value reported for logistic regression analysis between positive test result (outcome) and province (Prince Edward Island and Yukon excluded due to low cell counts); all four models had overall P < 0.0001
  2. Abbreviation: np not performed due to low cell counts
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Parasites & Vectors

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