Temporal Evolution of Immunity Distributions in a Population with Waning and Boosting

Figure 9

Contour plot of the solution for different boosting mechanisms. (a) Waning immunity, no boosts. (b) Boost to maximal level of immunity. (c) Uniform probability of boosting to any higher immunity level. (d) Nonlinear boosting function as in Figure 3(c).

(a) NOboost

(b) MAXboost

(c) ANYboost

(d) ODboost