FIG. 9.

Comparison of ${\mathcal{R}}_{0,c}$ for different conditions based on two different viral loadings ρ_v,maximum = 2.35 × 10⁹ copies/ml and ρ_v,average = 7 × 10⁶ copies/ml and if the ejection of droplets beyond the specified cutoff sizes is prevented. In each box, the red-line denotes the equal half-life condition $t_{n\frac{1}{2}}=t_{d\frac{1}{2}}$, irrespective of the phase. The lower and upper limit corresponds to $t_{n\frac{1}{2}}=0.01t_{d\frac{1}{2}}$ and $t_{n\frac{1}{2}}=100t_{d\frac{1}{2}}$, respectively. All data are obtained at T_∞ = 21.44 °C and RH_∞ = 50% and with (a) r_v = 0.05 implying a minimum infectious dose of 100 virions and (b) r_v = 0.005 implying a minimum infectious dose of 1000 virions.