Figure 1.

State transition diagram of our model. Every individual should be in one of the states, S, E, I_s, I_a, C, or R. The parameters in the figure are defined as follows: $\beta$: disease transmission rate of symptomatic patients. $\epsilon$: relative infectiousness of asymptomatic patients. $\alpha$: progression rate from state E to I_a or I_s ($1/\alpha$: incubation period); $p$: percentage of the asymptomatic case; $\delta$: test turn-in rate ($1/\delta$: time between testing and result confirmation). ${\gamma }_1$: recovery rate for infected but not tested individuals ($1/{\gamma }_1$: infectious period for non-tested infected patients). ${\gamma }_2$: recovery rate for symptomatic and test-confirmed individuals ($1/{\gamma }_2$: isolation period for test-confirmed patients). ${\gamma }_3$: recovery rate for asymptomatic individuals ($1/{\gamma }_3$: infectious period for asymptomatic patients).