Equilibrium stability regions with fixed risk behaviour propagation rate.

<p>The red curve, which represents the equilibrium HAART coverage needed for extinction of the HIV epidemic as given by <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0062321#pone.0062321.e148" target="_blank">equation (20</a>), separates the HIV-endemic and HIV-free regions. For less than approximately , the HIV epidemic is not sustained. For greater than approximately , the epidemic cannot be eliminated by HAART in the chronic HIV phase alone. The risk behaviour propagation rate is fixed at .