Fig. 11
From: Simulation applications to support teaching and research in epidemiological dynamics
The level of immunity (R(t)/N, left graph) and prevalence (I(t)/N, right graph) are plotted over 720 days for a set of comparative simulations of the deterministic continuous-time SIRS RAMP to illustrate the phenomena of endemicity as a function of waning immunity. Plots 1-6 represent loss-of-immunity rates of ρRS=0, 0.001, 0.002, 0.005, 0.01, and 0.03 respectively for individuals in class R. These corresponds to mean waiting (or residence) times in R (before returning to S) of ∞, 1000, 500, 200, 100, and 33.3 days respectively. Note that the value of the contact scaling rate KappaS =0.100 is moot because the Kappa adaptive contact RAM (Green roller below sliders) has been selected to be the constant value κ0=2 (see Fig. 4 for more details)