Coloured scanning electron micrograph (SEM) of HIV particles (red) budding from the membrane of a HeLa host cell. HIV (human immunodeficiency virus) a


Coloured scanning electron micrograph (SEM) of HIV particles (red) budding from the membrane of a HeLa host cell. HIV (human immunodeficiency virus) attacks CD4+ T-lymphocytes (specialised white blood cells), which are crucial in the body's immune system. It enters the cell and makes many copies of itself, which then destroy the cell as they emerge through its membrane. This severely weakens the immune system, causing AIDS (acquired immunodeficiency syndrome). Each virus is approximately 100 nanometres in diameter.


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