Table 1.
Herd‐level incidence risk and rate of two novel porcine coronaviruses (PEDV and PDCoV) in Ontario swine herds between 2014 and 2016, and estimated prevalence of positive cases at the end of each year based on data provided in the Ontario Swine Health Advisory Board (OSHAB) Disease Control Program (DCP) database (average number of herds for 2014–2016 = 1093)
| Year | Cumulative n of new cases | Incidence risk (%) | 95% CI (%) | Incidence rate (cases per herd‐year) | 95% CI (cases per herd‐year) | Number of cases at year‐end | Prevalence at year‐end (%) | 95% CI (%) |
|---|---|---|---|---|---|---|---|---|
| Porcine epidemic diarrhoea virus | ||||||||
| 2014 | 95 | 13.49 | (11.06–16.24) | 0.14 | (0.12–0.18) | 36 | 4.36 | (3.07–5.99) |
| 2015 | 29 | 2.97 | (2.00–4.24) | 0.03 | (0.02–0.05) | 27 | 2.25 | (1.49–3.26) |
| 2016 | 17 | 1.42 | (0.83–2.26) | 0.02 | (0.01–0.03) | 17 | 1.35 | (0.79–2.16) |
| Porcine deltacoronavirus | ||||||||
| 2014 | 8 | 1.14 | (0.49–2.23) | 0.011 | (0.005–0.022) | 4 | 0.48 | (0.13–1.24) |
| 2015 | 3 | 0.30 | (0.06–0.87) | 0.003 | (0.001–0.009) | 2 | 0.17 | (0.02–0.60) |
| 2016 | 1 | 0.08 | (0.00–0.45) | 0.001 | (0.000–0.005) | 2 | 0.16 | (0.02–0.57) |
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