Table 1.

Parameters of the considered model.

Symbol	Interpretation
μ	Rate of natural death
Λ	Recruitment rate intoS(t)
θ	Probability of an S(t) class to join C(t) class
σ	Death rate induced by COVID-19
β	Recovery rate of C(t) class
δ(x)	Force of infection of class S(t)
τ	Recovery rate of I(t) class
π	Rate of which an C(t) class is recovered
η	Rate of which treated persons become C(t)class
δ	Rate of transmission
p	Proportion that a contact is efficient enough to cause infection
w	Transmission parameter for C(t) class
λ	Rate of infectivity betweenS(t) class and D(t) class
k	Rate of contact