Figure 1.

Curves illustrating the result that for all parameter sets in all models increasing values of the parameter g lead to decreases in peak asexual-form densities. The two panels represent models with A, the three different forms of the immunologic function f₂, with parameter settings c = 0.01 and s = 1.4 for A1 and A3, s = 0.07 for model A2, and B, the three different forms of the parasitologic function f₁, with parameter settings c = 0.001 and s = 1.4. For model A3 the time lag L = 0.7. Horizontal axes represent values of g and vertical axes represent the base 10 logarithm of per microliter peak M abundance. With increasing values of g, peak M values in these examples show decreases of A, 67% for model A3, 17% for A1, and 7% for A2, and B, 59% for model B1, 54% for C1, and < 1% for A1. Note that the simplest, doubly-linear model, A1, is common to both panels and shows relatively flat responses in each.