Fig. 5.

The change of epidemic features with time for different $\alpha$ and $m_0$. The fitting epidemic curve $C_I(t)$, the number of individuals in the L state L(t) and in the A state A(t) versus time (unit: day) with the estimated parameters $\beta =0.273$, $\lambda =0.29$ when $\alpha =0.1$ in (a) and (b), and $\beta =0.271$, $\lambda =0.3$ when $\alpha =0.2$ in (c) and (d). The change of A(t) and L(t) with different $m_0$ in (b) and (d). The data is the cumulative number of confirmed cases of China except for Hubei province in (a) and (c). The values of other parameters are set as: ${\gamma }_1=\frac{1}{21}$, ${\gamma }_2=\frac{1}{10}$, ${\gamma }_3=\frac{1}{15}$, $\delta =0.03$, $l=0$