Figure 5

Effects of different moments that the susceptible and exported populations start to wear masks on the final number of the infected population, the final death toll, and the duration of the epidemic under \(\delta =1\), \(\eta =0.4\), \(\theta =0.3, \lambda =0.3, 0.5, 0.7, 0.9\). Vertical axis: (a): the final number of the infected population; (b): the final death toll; (c): the duration of the epidemic. Lateral axis: The moment that the susceptible and exported populations start to wear masks (\(t_{1}\))