Table 1 Parameters for the global risk model. Subscripts 1 and 2 referred to Ae. aegypti and Ae. albopictus respectively. Unless otherwise stated, parameter values were calculated following Caminade et al. [13]
From: Mapping the cryptic spread of the 2015–2016 global Zika virus epidemic
Symbol | Description | Calculation |
|---|---|---|
h1, h2 | Biting rates (per day)# | h1 = 0.67, [41] h2 = h1/2. |
ϕ1, ϕ2 | Vector preferences | ϕ1 = 1, ϕ2 = ϕ1/2. |
\( {\uptau}_1^{V\to H} \), \( {\uptau}_2^{V\to H} \) | Vector-to-host transmission probability | \( {\uptau}_1^{V\to H}=0.5 \), \( {\uptau}_2^{V\to H}={\uptau}_1^{V\to H}. \) |
\( {\uptau}_1^{H\to V} \), \( {\uptau}_2^{H\to V} \) | Host-to-vector transmission probability | \( {\uptau}_1^{H\to V}=0.1 \), \( {\uptau}_2^{H\to V}=0.33{\uptau}_1^{H\to V}. \) |
μ1, μ2 | Mortality rates (per day) | \( {\mu}_1=\frac{1}{1.22+\mathit{\exp}\left(-3.05+0.72T\right)}+0.196,\left(T<22{}^{\circ}C\right) \) \( {\mu}_1=\frac{1}{1.14+\mathit{\exp}\left(51.4-1.3T\right)}+0.196,\left(T\ge 22{}^{\circ}C\right) \) \( {\mu}_2=\frac{1}{1.1+\mathit{\exp}\left(-4.04+0.576T\right)}+0.11883,\left(T<15{}^{\circ}C\right) \) μ2 = 0.000339T2 − 0.0189T + 0.336, (15 ° C ≤ T < 26.3 ° C) \( {\mu}_2=\frac{1}{1.065+\mathit{\exp}\left(32.2-0.92T\right)}+0.073079.\left(T\ge 26.3{}^{\circ}C\right) \) |
ν1, ν2 | Extrinsic incubation rates (per day) | \( {\nu}_1=\frac{1}{4+\mathit{\exp}\left(5.15-0.123\ T\right)}, \) ν2 = ν1/1.03. |
m1, m2 | Vector-to-host ratios | Assumed to be proportional to the vector suitability values. The scaling factor was re-calibrated using the R0 estimate produced by Zhang et al. [11]. |
r | Human recovery rate (per day) | r = 1/7. |