Figure 1.

Block diagram of the stochastic compartmental SEIR model. Population “movements” between compartments (blocks representing stochastic states) follow binomial (B) or multinomial (M) distributions that are controlled by biological/epidemic parameters as marked on the arrows. S = susceptible, E = exposed, I_p = presymptomatic, I_A = asymptomatic, I_s = severely symptomatic, I_M = mildly symptomatic, T/H_D = treated/hospitalized to death, T/H_R = treated/hospitalized to recovery, R = recovered, D = dead. β = transmission rate. Definitions of other parameters are listed in Table S1.