Figure 2

Model simulations. Variations in peak magnitude and peak time of the infection curve for the A _s + I _s subpopulation. The mean (star) and standard deviation (bars) correspond to 1000 simulation runs for the initial population with cross-reactivity ($S_p^0/N$) of 5%, 10%, 15%, and 20%, and an infectious period of 5 days (black), 3.9 days (red), 2.2 days (green), and 0.5 days (blue). The fraction of infected individuals (with prior exposure to sH1N1) which develops symptomatic infection is: (a,b) p _p = 0; (c,d) p _p = 0.5p _s ; and (e,f) p _p = p _s .