The continuing rise in the population of people living with HIV reflects the combined effects of continued high rates of new HIV infections and the beneficial impact of antiretroviral therapy. As of December 2008, approximately 4 million people in low- and middle-income countries were receiving antiretroviral therapy—a 10-fold increase over five years (World Health Organization, United Nations Children’s Fund, UNAIDS, 2009). In 2008, an estimated 2.7 million [2.4 million–3.0 million]
Voir : http://data.unaids.org/pub/Report/2009/2009_epidemic_update_en.pdf