MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Smiling HIV-positive woman. This woman is infected with the human immunodeficiency virus (HIV) that causes AIDS. She is from the Gulu region of Uganda. AIDS is a disease that has reached epidemic proportions in Africa, where it has killed millions, although the use of generic AIDS drug treatments has enabled many HIV-positive Africans to remain healthy.
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