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Critical treatment surfaces for hookworm under annual treatment with R0 = 2, 3, 5 (a–c, respectively). Axes represent fraction effectively treated in each age group. Points above the surface lead to elimination within 20 years. Parameters: z = 0.92, k = 0.4, σ = 0.5 per year, β = ρ = (0.5, 0.5, 1, 2). (Adapted from Truscott et al. [40].) (Online version in colour.)
