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Killed 25 million people worldwide
Acquired Immune Deficiency Syndrome (AIDS) has led to the deaths of more than 25 million people since it was first recognized in 1981, making it one of the most destructive epidemics in recorded history. Despite recent improved access to antiretroviral treatment and care in many regions of the world, the AIDS epidemic claimed approximately 3.1 million (between 2.8 and 3.6 million) lives in 2005 (an average of 8,500 per day), of which 570,000 were children. UNAIDS and the WHO estimate that the total number of people living with the human immunodeficiency virus (HIV) has reached its highest level. There are an estimated 40.3 million (estimated range between 36.7 and 45.3 million) people now living with HIV. Moreover, almost 5 million people have been estimated to have been infected with HIV in 2005 alone. 

The pandemic is not homogeneous within regions with some countries more afflicted than others. Even at the country level there are wide variations in infection levels between different areas. The number of people living with HIV continues to rise in most parts of the world, despite strenuous prevention strategies. Sub-Saharan Africa remains by far the worst-affected region, with 23.8 million to 28.9 million people living with HIV at the end of 2005, 1 million more than in 2003. Sixty-four percent of all people living with HIV are in sub-Saharan Africa, as are more than 77% of all women living with HIV. South & South East Asia are second most affected with 15%.

The key facts surrounding this origin of AIDS are currently unknown, particularly where and when the pandemic began, though it is said that it originated from the apes in Africa.
 


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