Table 1.
Descriptive statistics1 using a disease control program database* to determine the median and 25th percentile amounts of time it took, in weeks, to eliminate porcine epidemic diarrhea virus.
| Variable | Number of premises | Median | 95% CI | 25th percentile | 95% CI |
|---|---|---|---|---|---|
| Herd type: | |||||
| Farrow-to-wean | 13 | 25 | (16, 31) | 18 | (2, 25) |
| Wean-to-finish | 4 | 42 | (32, NA) | 32 | (32, 55) |
| Farrow-to-finish | 15 | 32 | (16, 47) | 24 | (10, 31) |
| Finisher only | 84 | 33 | (30, 38) | 25 | (21, 28) |
| Nursery only | 17 | 23 | (14, 31) | 16 | (1, 23) |
| Farrow-to-feeder | 5 | 43 | (18, NA) | 27 | (18, 79) |
| Season: | |||||
| Winter | 46 | 34 | (31, 38) | 29 | (25, 32) |
| Spring | 58 | 37 | (28, 42) | 24 | (20, 28) |
| Summer | 26 | 24 | (17, 28) | 16 | (3, 22) |
| Fall | 8 | 11 | (1, 36) | 1 | (1, 16) |
| Year: | |||||
| 2014 | 92 | 30 | (26, 35) | 23 | (20, 25) |
| 2015 | 27 | 34 | (30, 64) | 24 | (12, 33) |
| 2016 | 16 | 32 | (21, 44) | 21 | (3, 32) |
| 2017 | 3 | 18 | (13, NA) | 13 | (13, NA) |
The Area Regional Control and Elimination program (ARC&E) database was used to collect diagnostic data on porcine epidemic diarrhea virus herd status of Ontario swine herds on a weekly basis using the Animal Health Laboratory (AHL) at the University of Guelph. Premises that volunteered to participate in the program from January 2014 to October 2017 were included in the study. Descriptive survival analysis statistics are described above.
CI, confidence interval; SE, standard error.
Kaplan-Meier survival curves by herd type, season of diagnosis and year of diagnosis were created. Kaplan-Meir estimates of the median and 25th percentile time in weeks to eliminate porcine epidemic diarrhea virus was calculated.