Transmission

At the end of 2011, according to Joint United Nations Program on Human immunodeficiency virus (HIV)/Acquired immunodeficiency syndrome (AIDS) (UNAIDS), an estimated 34 million people were living with HIV worldwide. The number of people dying of AIDS-related causes fell to 1.7 million in 2011, down from a peak of 2.2 million in the mid- 2000s.