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Average strain lifetime as a function of the cross-immunity parameter a, for R0=2, b=0.9 and a genotype with six loci and three alleles. Results for a recovery rate of (a) σ=50 per year and (b) σ=100 per year are shown (population size: blue dots, 1 000 000 000; red dots, 300 000 000; green dots, 90 000 000).
