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Dependence of variability, as measured by the coefficient of variation and calculated using the moment equations, in the number of infective hosts seen about the endemic equilibrium as the basic reproductive number is varied. Parameter values are as follows: p=0.2; q=0.15; ξ=δ=1/7; H=100; and V=1000; and the biting rate, k, is varied to give the range of R0 values shown.
