DR KLAUS BOLLER / SCIENCE PHOTO LIBRARY DR KLAUS BOLLER / SCIENCE PHOTO LIBRARY
Budding HIV particles. Coloured transmission electron micrograph (TEM) of HIV particles (blue and yellow) budding from the membrane of the host cell (orange). HIV (human immunodeficiency virus) attacks CD4+ T-lymphocytes, white blood cells that are a crucial part of the body's immune system. It enters the cell, hijacks the cell's machinery to make more copies of the virus, and the new virus particles then burst from the membrane of the cell, killing it. This severely weakens the immune system, causing AIDS (acquired immunodeficiency syndrome). The disease makes the patient susceptible to diseases that would otherwise be harmless.
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