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Strain competition minimizes endemic susceptible density. Dashed line: σα = 0.3, and συ = 0.6. Endemic susceptible density S* increases strictly monotonically in decay rate ξ. Solid line: σα = 0.3, and συ = 1.2. Endemic susceptible density S* minimized at , given by equation (16). Dotted line: σα = 1.2, and συ = 0.3. Endemic susceptible density declines strictly monotonically in ξ. Parameters: μ = 0.5, and γ = 5.
