Fig. 4
Comparison of the susceptible compartment S(t) for different values of the fractional-order \(\zeta\). Parameters for the Disease-Free Equilibrium (DFE) case: \(\mu =1/(67.7 \times 365)\), \(\Pi = \mu \times 230557367\), \(a_1=0.8983\), \(a_2=0.3827\), \(\omega =0.01\), \(\kappa =0.3129\), \(\delta =0.9982\), \(q=0.9931\), \(\rho _1=0.3028\), \(\rho =0.7926\), \(d=0.6784\), \(\theta =0.01\), \(\psi =0.6\), \(\nu _1=2\times 10^{-4}\), \(\nu _i=0.02\) (for \(i=2,...,6\)).
