Figure 2

The solid blue curves represent the values of log₁₀ (E(t)) and log₁₀ (I(t)), where the data of E(t) and I(t) are reported in²⁹. The solid red curves are simulated by using the model (1), the vertical segments are shown the 95% confidence intervals of the values of log₁₀ (E(t)) and log₁₀ (I(t)). The values of parameters are given in Table 1. The initial values used in the simulations are given in Table 3.