Table 1.
Definition of parameters and values used for simulation of the spread of PRRS virus among pig farms in Lira district, Uganda, and their source references.
| Parameter | Value | References |
|---|---|---|
| Total number of farms | 2,000 | Lira district veterinary office |
| Small | 1,170 (58.5%) | (11) |
| Small scavenging | 170 (8.5%) | (11) |
| Medium | 460 (23%) | (11) |
| Large | 200 (10%) | (11) |
| Infectious clinical period (small scale and small scavenging) |
BETAPert (6, 8, 12 weeks) | (28) |
| Infectious clinical period (Medium) |
BETAPert (8, 10, 16 weeks) | (28) |
| Infectious clinical period (Large) |
BETAPert (8, 12, 22 weeks) | (28) |
| Natural immunity | 26.5 weeks | (29) |
| Transmission probabilities | ||
| Probability of transmission by direct contact | 1 | (21, 23, 30) |
| Probability of transmission by indirect contact | 0.1 | (21, 23, 30) |
| Distance for only direct contact | BETAPert distribution (0.1, 5, 20) | The shortest distance between farms (0.1 km), the most likely distance: (5 km); maximum distance: 20 km because farmers purchase from within their sub-county of which, on average, sub-counties are 20km in diameter |
| Distance for indirect contact (by scavenging and equipment sharing) | BETAPert distribution (0.1, 1, 3) | (31) |