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Population size and prevalence of disease along a gradient of decreasing birth rate. Lines as in figure 1. (a) Sterilizing disease with frequency-dependent transmission; β=0.3. (b) Sterilizing disease with density-dependent transmission; β=0.03. Throughout: b (max) =1, d=0.5, m=0.2, K=100, lattice=10×50 cells.
