http://www.sciencemag.org/news/2018/06/ending-aids-these-three-places-show-epidemic-far-over

At first glance, Nigeria, Russia, and Florida have little in common. But each has had difficulty mounting an effective response to HIV/AIDS at a time when neighboring countries or states, buoyed by recent research advances, have made progress toward bringing their epidemics to an end.

Five of the main metrics that public health experts track to gauge progress against HIV are: How many people are living with the virus? What is the rate of new infection? What percentage of infected people are receiving antiretroviral drugs, which both stave off disease and prevent transmission? How many infected people have progressed to AIDS and how many have died from it? And how many children are infected by their mothers?