Fig. 1.

Flow-chart of COVID-19 model showing the flow of humans between different compartments. The susceptible population is denoted by $S$, the exposed population is denoted by $E$, the infectious asymptomatic population is denoted by $I_a$, the infectious symptomatic population is denoted by $I_s$, the isolated infectious population is denoted by $I_c$, and the recovered population is denoted by $R$. The parameters of the model are described in the text.