Figure 7From: Impact of viral drift on vaccination dynamics and patterns of seasonal influenza Optimal vaccine distribution for 12 seasons to achieve the minimum number of infections in each season. Vaccine efficacy in prevention of infection is 60%, and m 1 and m 2 represent the durations of immunity induced by natural infection and vaccination, respectively, in the absence of re-exposure or vaccination following priming. For each season, red circle, blue dot, and plus sign represent a possible scenario for vaccine distribution to susceptible, previously vaccinated, and previously recovered classes of individuals, respectively. The total fraction of the population vaccinated is 10% (a,b,c,d) and 20% (e,f,g,h). Other parameter values are given in Table 1.Back to article page