Fig. 4.

Test of the effect of the long-term partnership duration and the rate of acquiring long-term and casual partners on the reproduction numbers evaluated at baseline HIV parameter values shown in Table 1, Table 2 with the exception of τ and ξ. Both figures use $\xi =10\text{\%}$. The p and z values were chosen to keep the average number of partners over one year to be $4/3$. The vertical scale is different for (a) and (b) to best illustrate the effect of different p, z, and τ values for the different population groups. Figure (a) represents MSM results and (b) WSM-MSW results.