Table S1.

State variable and parameter descriptions

Variable	Description
$S$	Susceptible class
$E_1$	Latent stage not infectious
$E_2$	Latent stage infectious
$I_1$	First stage of symptomatic
$I_2$	Second stage of symptomatic
$R$	Recovered class
$N$	Total population
Parameter	Description	Values (references)
${\beta }_1,{\beta }_2,{\beta }_3$	Transmission rates for $E_2,I_1,I_2$ classes	$0.3125,0.5,0.176$ (23)
${\sigma }_1$	First stage incubation rate	0.3125 (23)
${\sigma }_2$	Second stage incubation rate	0.5 (23)
${\gamma }_1$	First stage of recovery	0.5 (23)
${\gamma }_2$	second stage of recovery	0.176 (23)
$c_h$	COVID-19 case fatality	0.018 (35)
$\mu$	Death rate	Not used