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

Michelle Evason; Jason W. Stull; David L. Pearl; Andrew S. Peregrine; Claire Jardine; Jesse S. Buch; Zachary Lailer; Tom O’Connor; Ramaswamy Chandrashekar; J.  Scott Weese

doi:10.1186/s13071-019-3299-9

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)
Ontario	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)
Alberta	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)
British Columbia	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)
Manitoba	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)
New Brunswick	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)
Newfoundland	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)
Nova Scotia	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)
Prince Edward Island	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)
Quebec	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)
Saskatchewan	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)
Yukon	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)

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
Abbreviation: np not performed due to low cell counts

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