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. 2007 Apr 25;5(18):3–13. doi: 10.1098/rsif.2007.0236

Figure 1.

Figure 1

Equilibrium prevalence as a function of vaccination rate for the system in appendix A. The figure assumes that vaccinated individuals are completely protected against both strains. Strain 1 dominates for vaccination rates between zero (no vaccination) and 1. For vaccination rates between 1 and 2 the two strains coexist. Strain 2 dominates for vaccination rates between 2 and 2.5. For higher vaccination rates, both strains are eliminated. The reproduction numbers of the strains in the absence of vaccination are respectively R1(0)=4 and R2(0)=6.