Table A.5.
Parameters for the transmission of bluetongue virus by Culicoides imicola, where different from those in Table A.1
| Description | Symbol | Estimate, distribution or function | Comments and references | |
|---|---|---|---|---|
| Probability of transmission from host to vector | β | β(1.02, 232.1) | Distribution derived from data on experimental infection of field‐caught C. imicola with BTV‐1, 2, 4 or 8 (Del Rio et al., 2012) | |
| Reciprocal of the time interval between blood meals | a | a(T) = 0.00014T(T − 3.7) (41.9 − T)1/2 . 7 | Rate for C. sonorensis (Mullens et al., 2004) adjusted to reflect data for C. imicola (Veronesi et al. 2009) | |
| Extrinsic incubation period (EIP) | Mean | 1/v | v(T) = α(T − T min) | Reciprocal of mean EIP Depends on temperature (Carpenter et al., 2011); distributions derived from data on experimental infection of field‐caught C. imicola with BTV‐1 (Carpenter et al., 2011); k is constrained to take integer values |
| No. stages | k | γ(1.12, 83.33) | ||
| Virus replication rate | α | N(0.016, 0.0026) | ||
| Threshold temperature for virus replication | T min | N(12.60, 1.17) | ||
| Vector activity | b 11 | −1.5 | Selected so that there is a single peak of activity in September–October | |
| b 21 | −0.1 | |||
| b 12 | 0 | |||
| b 22 | 0 | |||