Table 2.
Pathogen prevalence in blacklegged ticks submitted from humans and companion animals: Ontario, Canada (2011–2017)
| Pathogen | Humans | Companion animals | All hosts |
|---|---|---|---|
| Infection prevalence, maximum likelihood estimate % (95% CI) | |||
| B. burgdorferi* | 17.5 (16.97–18.09) | 9.9 (9.15–10.78) | 15.8 (15.35–16.30) |
| B. miyamotoi** | 0.35 (0.25–0.47) | 0.39 (0.22–0.65) | 0.36 (0.27–0.46) |
| A. phagocytophilum* | 0.43 (0.34–0.54) | 0.41 (0.26–0.60) | 0.43 (0.35–0.52) |
| Ba. microti† | 0.054 (0.022–0.11) | 0.056 (0.010–0.18) | 0.050 (0.025–0.10) |
| Co-infections‡ | Infection prevalence, % (no. samples pos./no. samples tested) | ||
|---|---|---|---|
| B. burgdorferi + B. miyamotoi** | 0.11 (11/10,368) | 0.16 (4/2479) | 0.12 (15/12,847) |
| B. burgdorferi + A. phagocytophilum* | 0.087 (9/10,368) | 0.12 (3/2479) | 0.093 (12/12,847) |
| B. burgdorferi + Ba. microti† | 0.029 (3/10,368) | 0.0 (0/2479) | 0.023 (3/12,847) |
CI confidence interval
*Blacklegged tick samples collected and tested from 2011 through 2017
**Blacklegged tick samples collected and tested from 2014 through 2017
†Blacklegged tick samples collected and tested from 2013 through 2017
‡Co-infection prevalence for single-tick samples only, by PHU (all hosts): B. burgdorferi + B. miyamotoi: HAL (n = 1), HDN (1), HPE (1), LGL (3), NIA (3), NPS (1), OTT (1), REN (1), SMD (2) and WEC (1); B. burgdorferi + A. phagocytophilum: ALG (1), DUR (1), HKP (2), HUR (1), KFL (2), LGL (2), NWR (1), OTT (3), REN (1), THB (2) and TOR (2) [multiple-tick samples: HKP (2), KFL (1), LGL (1), OTT (2)]; and B. burgdorferi + Ba. microti: HAM (1), HKP (2), LGL (1), NWR (1) and TOR (1) [multiple-tick samples: HKP (1), LGL (1), NWR (1)]