At the beginning of 2012, worldwide the number of people living with HIV to 34.0 [31,4-35,9] million.
An estimated 0.8% of adults aged 15-49 living with HIV.
Africa Sub-Saharan Africa remains the most affected region with almost one-twentieth of adults (4.9%) in the region are living with HIV, accounting for 69% of all people living with HIV worldwide. Despite the fact that the regional prevalence of HIV infection in sub-Saharan Africa almost 25 times higher than in Asia, the total number of people living with HIV in the South, Southeast and East Asia accounts for almost 5 million. After sub-Saharan Africa most affected regions are the Caribbean and Eastern Europe and Central Asia, where in 2011, 1.0% of adults were living with HIV.
Worldwide, the number of people infected with HIV, continues to decline: the number of people newly infected with HIV (adults and children) in 2011 (2.5 [2.2-2.8] million) was 20% less than in 2001. There are also obvious variations. The most dramatic decrease in the number of people newly infected with HIV since 2011, noted in the Caribbean (42%) and sub-Saharan Africa (25%).

In some other parts of the world trends in indicators related to HIV (children and adults) of concern. After 2001, the number of new infections per year in the Middle East and North Africa increased by more than 35% (from 27 000 [22 000-34 000] to 37 000 [29 000 - 46 000]). Available data indicate that the rate of HIV infection in Eastern Europe and Central Asia, which over the years has remained relatively stable in the late 2000s, began to rise.

In the last decade, many national AIDS epidemic has changed dramatically. From 2001 to 2011 in 39 countries, HIV incidence among adults has decreased by more than 25%.