Table 1.
Definition of fitted and fixed parameters used in SEI models.
| parameter | definition | fixed or fitted* parameter |
|---|---|---|
| βjj, βaa | age-specific density-dependent transmission (day−1) | a |
| β′jj, β′aa | age-specific frequency-dependent transmission (individual−1 day−1) | a |
| βf | indirect transmission (day−1 per unit of fomite) (age-invariant) | a |
| γ | infectious period = 1/γ (day−1) | a |
| σ | latent period = 1/σ (day−1) | 30 days |
| α | disease-induced mortality rate = 1/α (day−1) | 100 days |
| μj | juvenile per capita mortality probability (year−1) | 0.3b |
| μa | adult per capita mortality probability (year−1) | 0.5b |
| ω | per capita reproductive rate of mite on infected individuals (day−1) | a |
| ɛ | rate of loss of the pathogen in environment = 1/ɛ (day−1) | 10 days |
| S0j | initial density of susceptible juveniles (km−2) | 21 |
| S0a | initial density of susceptible adults (km−2) | 36 |
| I0j | initial density of infected juveniles (km−2) | 0.01 |
| I0a | initial density of infected adults (km−2) | 0.01 |
| F0 | initial density of fomites (normalized) | 1 |
aFitted parameter.
bAnnual probabilities were converted to daily rates by –ln(μ)/360.