Table 1 Description of variables and parameters of the model

Π

Constant immigration rate

160 week⁻¹

–

β

Contact rate

Variable

–

\(\beta_{E}\)

Ability to cause infection by exposed individuals \((0\leq \beta_{E}\leq 1)\)

0.21

–

\(\beta_{I}\)

Ability to cause infection by infectious individuals \((0\leq \beta_{I}\leq 1)\)

0.84

–

μ

Natural death rate

0.000263 week⁻¹

[35]

σ

Duration of latency

2.32 week⁻¹

[36–38]

γ

Recovery rate in infectious period

1.4 week⁻¹

[36–38]

κ

Recovery rate in latent period

1.3 week⁻¹

[39]

α

Disease-induced mortality rate

0.065 week⁻¹

[40]