CHRIS SATTLBERGER / SCIENCE PHOTO LIBRARY CHRIS SATTLBERGER / SCIENCE PHOTO LIBRARY
AIDS test. Laboratory scientists performing AIDS tests on blood samples. AIDS (acquired immune deficiency syndrome) is a disease caused by the human immunodeficiency virus (HIV). The virus attacks T-lymphocyte white blood cells, which are important cells in the human immune system. As the T-lymphocytes are destroyed, the immune system becomes severely damaged, and common infections become life-threatening. This laboratory is in Zimbabwe. AIDS in Africa is an epidemic in 2002, with over 28 million people thought to be infected. In Zimbabwe itself, one in four people carries the virus in 2002.
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