Fig. 2.

Example of convergence to a disease-free equilibrium for four different sets of initial conditions. The $E$, $Q$, $I$, $J$ populations rapidly converge to zero and the $S$ and $R$ populations converge to equilibrium values $S_1^{\ast }=40661$ and $R_1^{\ast }=1.196\times 10^7$ (Beijing).

Fig. 2(a).

(a) Susceptible population.

Fig. 2(b).

(b) Exposed population.

Fig. 2(c).

(c) Quarantined population.

Fig. 2(d).

(d) Infectious population.

Fig. 2(e).

(e) Isolated population.

Fig. 2(f).

(f) Recovered population.