Fig. 4.

The change of A(t) and L(t) versus time (unit: day) under different $m_0$ after lifting the lockdown of the Wuhan. The temporal trend of the number of individuals in the A and L state when a $\alpha =0.05$, $m_0=0.27$, b $\alpha =0.05$, $m_0=0.35$, c $\alpha =0.2$, $m_0=0.25$ and d $\alpha =0.2$, $m_0=0.3$. The values of other parameters are set to: ${\gamma }_1=\frac{1}{21}$, ${\gamma }_2=\frac{1}{10}$, ${\gamma }_3=\frac{1}{15}$, $\delta =0.03$, $l=0.0083$ before January 23, 2020, and $l=0$ later