Fig 4. The impact of mixing on endemic prevalence in the model without treatment.
(A) Total prevalence in the population. The color of the bars corresponds to the variance in the rate of partner change, σ2. Note that prevalence is zero for the parameters where HIV is not able to spread (yellow curves for all levels of mixing and the green curve for proportionate mixing in Fig 3). (B) Prevalence per risk group for a population with a variance in the rate of partner change σ2 of 32.6 yr−2 corresponding to the data. The color of the bars denotes the number of the sexual activity class.