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Table 7 Risk factors for positivity to CVBD agents

From: Countrywide serological evaluation of canine prevalence for Anaplasma spp., Borrelia burgdorferi (sensu lato), Dirofilaria immitis and Ehrlichia canis in Mexico

Dependent variable risk factor P OR 95 % CI
Positivity    
  ≥ 1 year 0.011 1.94 1.15–3.29
 Medium size 0.003 1.54 1.16–2.07
 Large size 0.002 1.42 1.14–1.79
 Outdoors < 0.0001 2.33 1.82–2.98
 Tick contact < 0.0001 7.13 4.89–10.39
 TTI prevention < 0.0001 2.58 1.66–4.03
 Clinical signs < 0.0001 3.58 2.91–4.42
Positivity to A    
 Outdoors 0.001 2.02 1.31–3.09
 Tick contact < 0.0001 11.93 4.39–32.42
 Clinical signs < 0.0001 2.63 1.88–3.67
Positivity to Bb    
 Clinical signs 0.022 nd nd
Positivity to Di    
 Medium size 0.035 1.83 1.03–3.24
 Large size 0.004 2.04 1.24–3.36
 Outdoors < 0.0001 4.12 1.98–8.59
 Tick contact 0.002 3.24 1.48–7.08
 Clinical signs < 0.0001 2.52 1.61–3.95
Positivity to Ec    
  ≥ 1 year 0.014 2.02 1.14–3.57
 Medium size 0.018 1.44 1.06–1.94
 Large size 0.009 1.37 1.08–1.74
 Outdoors < 0.0001 2.21 1.69–2.87
 Tick contact < 0.0001 7.23 4.74–11.04
 TTI prevention < 0.0001 3.27 2.10–5.09
 Clinical signs < 0.0001 3.58 2.88–4.45
Co-infections    
 Large size 0.007 1.75 1.16–2.62
 Outdoors < 0.0001 3.06 1.82–5.14
 Tick contact < 0.0001 14.22 4.50–44.91
 TTI prevention 0.033 1.93 1.04–3.58
 Clinical signs < 0.0001 4.08 2.79–5.96
  1. Abbreviations: OR odds ratio, CI confidence interval, nd no data