Figure 3

Time domain behaviors of solutions of SDDEs model (2) (right) and the corresponding deterministic model (1) (left) when \({\mathcal{R}}_{0}^{s}=0.38<1\), with \(\eta =0.0005\), \(\xi =0.6\), \(\beta =0.01\), \(\sigma =0.12\), \(\alpha =0.3\), \(\gamma =0.02\); \(\tau =1.4\) and white noises \(\nu _{1}=\nu _{2}=0.02\), \(\nu _{3}=0.01\), \(\nu _{4}=0.02\). The infection dies out with probability one