Table 2.
Parameter definitions and values
| Parameter | Description | Unit | Value | Range | Method |
|---|---|---|---|---|---|
| β | Susceptible person-to -infected person contact rate | km2·individuals−1·month−1 | – | ≥ 0 | – |
| b | Scaled susceptible person-to-infected person contact rate | Month−1 | – | ≥ 0 | Curve fitting |
| βw | Reservoir-to-Person contact rate | ml·cells−1·month−1 | – | ≥ 0 | – |
| bw | Scaled Reservoir-to-Person contact rate | Month−1 | – | ≥ 0 | Curve fitting |
| βpʹ | Pig-to-Person contact rate | km2·pigs−1·month−1 | – | ≥ 0 | – |
| bpʹ | Scaled pig-to-person contact rate | Month−1 | – | ≥ 0 | Curve fitting |
| βwʹ | Reservoir-to-Pig contact rate | ml·cells−1·month−1 | – | ≥ 0 | – |
| bwʹ | Scaled Reservoir-to-Pig contact rate | Month−1 | – | ≥ 0 | Curve fitting |
| βp | Pig-to-pig contact rate | km2·pigs−1·month−1 | – | ≥ 0 | – |
| bp | Scaled Pig-to-Pig contact rate | Month−1 | – | ≥ 0 | Curve fitting |
| σ | Scaled force of infection from environment-to-pig and pig-to-pig | Month−1 | 0.9 | ≥ 0 | Reference [26] |
| ω | Incubation relative rate of individuals | Month−1 | 0.7500 | 0.5–2.5 | Reference [25, 27] |
| γ | Recovery rate of the infectious | Month−1 | 1.0000 | 0.7143–1.0714 | Reference [25] |
| γ′ | Recovery rate of the asymptomatic | Month−1 | 1.0000 | 0.7143–1.0714 | Reference [25] |
| ε | Pathogen lifetime relative rate | Month−1 | 1.3333 | ≥ 1.3333 | Reference [28] |
| f | Hepatitis E antibody elimination rate | Month−1 | 0.00595 | ≥ 0.00595 | Reference [29] |
| ωp | Incubation relative rate of pig | Month−1 | 1.0000 | 0–1 | Reference [23] |
| τ | Slaughtered rate of infected pigs | Month−1 | 0.333 | 0–1 | Reference [23] |
| μ | The rate of the infected person shedding the virus to the reservoir | Cells·km2/(cells·month·ml) | – | 0–1 | Assumption |
| μ′ | The rate of asymptomatic person shedding the virus to the reservoir | Cells·km2/(cells·month·ml) | – | 0–0.5 | Assumption |
| μʹʹ | The rate of infected pigs shedding the virus to the reservoir | Cells·km2/(cells·month·ml) | – | 0–0.5 | Assumption |
| p | Proportion of the symptomatic | 1 | 0.9 | 0–0.15 | Reference [25] |
| bri | Birth rate of population | 1 | 0.00931 | 0–1 | Statistical Yearbook |
| dri | Death rate of population | 1 | 0.00702 | 0–1 | Statistical Yearbook |
| brp | Birth rate of pig herd | 1 | 0.00667 | 0–1 | Reference [23] |
| drp | Death rate of pig herd | 1 | 0.00667 | 0–1 | Reference [23] |
| x | Ratio of pig population density to population density | 1 | 0.333 | ≥ 0 |
China Rural Statistical Yearbook, the main data bulletin of the sixth national census in 2010 |
| k |
Relative transmissibility rate of asymptomatic to symptomatic individuals |
1 | 1 | 0–1 | Reference [25] |
| δ | Monthly vaccination ratio | 1 | 1 | 0–1 | Artificial setting |
| λ | Effective rate of vaccination | 1 | 1–0.933 | 0–1 | Reference [29] |
| φ | Vaccination onset rate | Month−1 | 1/6 | 0–1 | Reference [30] |
–: not applicable