Model.

Stages are depicted as boxes, arrows show transition rates. The entire population is grouped into the susceptibles (S), the infected which are further classified into the latent (E), the prodromal, (P), the fully infectious at home, (IHome), in hospital, (IHosp), and in isolation, (IIso), and the recovered (R). The dead are classified into those awaiting an unsafe Funeral (F)—still infectious, after funeral (BF), or buried safely (BIso). Trace back is modeled through the force of infection for infections subject to trace back λ*, resulting in individuals in transient stage (E*, P*, I(*, Home), I(*, Hosp)) who will get traced back later, and those () who have already been traced back or diagnosed—these are isolated; λ and E, P, IHome, IHosp describe infections not subject to trace back. The rates ε, γ, δHome, δHosp, δIso describe the progression of the infections. α is the rate of successful trace back, φ the one of funerals, dHome, dHosp indicate the fractions of safe funerals of non-diagnosed individuals. fHome, fHosp, fIso are the fractions of fully infectious in different treatment, where are the related death rates.