BSIP, CAVALLINI JAMES / SCIENCE PHOTO LIBRARY BSIP, CAVALLINI JAMES / SCIENCE PHOTO LIBRARY
AIDS viruses. Coloured transmission electron micrograph (TEM) of human immunodeficiency viruses (HIV, round) budding from the surface of an infected T-lymphocyte white blood cell (T-cell). HIV causes AIDS (acquired immune deficiency syndrome). The T-cell, partly visible at lower right, is part of the body's immune system. After infection, HIV instructs the cell to reproduce more viruses which bud away from the cell, ultimately killing it. With fewer T-cells, the patient becomes vulnerable to formerly harmless infections. This condition is known as AIDS. Magnification unknown.
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