Table 1.
Proportion of PEDV-positive pig farms in Vietnam from January 2018 to February 2019
| Variable | Number of collected farms | Number of PED-positive farms | Proportion of PED-positive farms | 95% CI |
|---|---|---|---|---|
| Farm status | ||||
| Companies | 197 | 68 | 34.5 | 27.9–41.6 |
| Private | 130 | 33 | 25.4 | 18.2–33.8 |
| Production type | ||||
| FF | 185 | 57 | 30.8 | 24.2–38.0 |
| FW | 88 | 21 | 23.9a | 15.4–34.1 |
| Nucleus | 10 | 7 | 70.0b | 34.8–93.3 |
| WF | 44 | 16 | 36.4 | 22.4–52.2 |
| Area | ||||
| Northeast | 52 | 19 | 36.5a | 23.6–51.0 |
| Northwest | 11 | 3 | 27.3 | 6.0–61.0 |
| Red River Delta | 220 | 74 | 33.6a | 27.4–40.3 |
| North central coast | 44 | 5 | 11.4b | 3.8–24.6 |
| Size | ||||
| < 600 | 160 | 38 | 23.8a | 17.4–31.1 |
| ≥ 600 | 167 | 63 | 37.7b | 30.4–45.5 |
Values with different letters are significantly different from the others (P < 0.05)