932186.fig.003
Figure 3: The global asymptotic stability of the endemic equilibrium when . The green line, the red line, and the blue line correspond to the initial values (3.4 × 105, 1.04 × 104, 3.6 × 103, 950, 930, 390), (3.4 × 105, 6 × 103, 2.1 × 103, 580, 570, 220), and (3.65 × 105, 8.2 × 103, 3 × 103, 800, 780, 330), respectively. We chose . Other parameter values are in Table 1.