Fig. 4.

Equivalent ${\beta }_0$ under the model where all symptomatic persons wear a mask (whether they otherwise habitually wear a mask or not), under varying levels of efficacy for the masks given to the symptomatic (${\epsilon }_o^I$), and in combination with different degrees of coverage and effectiveness for masks used by the rest of the general public. Results are for simulated epidemics with a baseline ${\beta }_0$ of 1.5 day⁻¹.