TABLE 1.
Model parameters used for simulation model between pig farm spread of ASF virus in the Red River Delta region, Vietnam
| Parameters | Value | Reference |
|---|---|---|
| Total farms (n) | 7,882 | General statistics office of Vietnam |
| Small | 5,499 (69.77%) | |
| Medium | 1,989 (25.23%) | |
| Large | 394 (5.00%) | |
| Transmission probability | ||
| Direct contact | 0.6 a | (Guinat et al., 2016) |
| Indirect contact to small/medium farms | 0.6 | Contaminated products (e.g. swill) and vehicle movements are the main source of infection which was determined as the same as direct contact |
| Indirect contact to large farms | 0.006 | Due to high biosecurity |
| Infectious duration | ||
| Small | 52 weeks | Assumptions |
| Medium | 10–12 weeks | Assumptions |
| Large | 4 weeks | Assumptions |
| Contact distances between farms (km) | BetaPERT (0.5, 30, 300) | |
a
The median value was used.