Fig. 5

Sensitivity analyses on the HCV threshold for concentrated HIV epidemic (HIV prevalence >5%). These graphs illustrate the effect, on the HCV threshold for concentrated HIV epidemic, of the HCV/HIV infectiousness ratio (a), the degree of assortative mixing (b), the scale (c) and shape (d) parameters of the gamma distribution of the population across risk groups, the exponent parameter of the power law distribution of risk behavior (e), duration of injecting (f), and anti-retroviral therapy (ART) coverage (g). For each set of parameter values in these graphs, the average injecting risk behavior was varied; endemic HCV and HIV prevalence for each value of average injecting risk behavior were generated; and the HCV threshold for concentrated HIV epidemic was identified and plotted