Fig. 3.
Plot of the ADE factor vs. proportion of runs that have minima of the infected classes below a threshold of 10−7 (a). Plot of the AEE (see text) at each value of the ADE factor; the errorbars indicate one standard deviation over the 400 runs (b). The black markers indicate the strictly serotype-symmetric situation. The asymmetric transmission rates are exactly the ones used in Fig. 1 while the symmetric ones are βi = 500, as in Fig. 2; other parameter values are as in Table A1. The values of the birth/death rates, duration of the incubation period and recovery rate are as in Table A1.