Fig. 1
The scheme of the SECIR model, which distinguishes susceptible (S) individuals without immune memory of CoV, exposed (E) who already carry the virus but are not yet infectious to others, carriers (CI,R) who carry the virus and are infectious to others but do not show symptoms, infected (I,IH,R,X) who carry the virus with symptoms and are infectious to others, hospitalized (HU,R,S) who experience a severe development of the disease, patients transferred to intensive care unit (UR,D), dead (D), and recovered (RZ,X) who acquired immune memory and cannot be infected again. Recovery happens from each of the states CR,IX,IR,HR,UR. See Table 1 for parameter values