Figure 4.

Virus deposition along the airway generation branches and infection (a) its changes with respect to the initial virus load and (b) distribution of ACE2 expressed cells over the respiratory airways, and (c) simulation of total viral particles (C), infected cells (I), ACE2 (A) and immune T-cell (T) concentrations over time as a result of the viral infection; T-cell count in the absence of virus $T_0={10}^3\mathrm{Copies}/\mu \mathrm{l}$(a value within the $T_0$ range given in Table 1).