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(a) Dynamical map for model with no strain-transcending immunity, with an antigenic genotype of four loci and three alleles. Dynamical regimes labelled as figure 3a; (b) as (a) but showing average prevalence-weighted number of strains; (c) as (a) but for model with strain-transcending immunity, assuming γ=3/year (i.e. four month duration of strain-transcending immunity); (d) as (c) but showing average prevalence-weighted number of strains.
