How prevalent is HIV across the world?

1% aged 15-49. According to 2006 data, an estimated 1% of the world's population aged 15-49 has HIV (human immunodeficiency virus). This equals 33.4 million people. The majority of infections worldwide are in sub-saharan africa.
See below. In 2007 there were 33 million people living with hiv/aids worldwide including 2 million children under 15. In 2007 2.7 million people were newly infected with hiv, of which 70% were in sub-saharan africa, the most severely affected region of the world.