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. 2013 Jul 25;8(7):e68940. doi: 10.1371/journal.pone.0068940

Figure 3. Modeling a vaccine with increased efficacy against drug-resistance determinants for an epidemic pathogen (seasonal influenza).

Figure 3

a, SIR model with a proportion Inline graphic of the population as vaccinated susceptibles (Inline graphic subscript) and Inline graphic as unvaccinated susceptibles (Inline graphic subscript), who can get infected with either the drug-sensitive (Inline graphic superscript) or –resistant (Inline graphic superscript) strains, get treated (Inline graphic superscript) or not (Inline graphic superscript) and are removed due to recovery or death (Inline graphic). This is the model of Ref. [2], modified to include vaccination. b, Model evaluations for final cumulative proportion resistant among all infections over the course of one season, as a function of the additional vaccine efficacy Inline graphic against resistant, compared to sensitive strains (x-axis) and the fraction of influenza infections treated (y-axis). Here, vaccine coverage is 40% and Inline graphic = 59%.