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t-shirts hiv t-shirts viruses t-shirts virus t-shirts infection t-shirts t lymphocyte t-shirts human immunodeficiency virus t-shirts aids t-shirts aids virus t-shirts immune system t-shirts t cells t-shirts infections t-shirts t lymphocytes t-shirts t-lymphocytes t-shirts acquired immune deficiency syndrome t-shirts t-cell t-shirts

photographs hiv photos viruses photos virus photos infection photos t lymphocyte photos human immunodeficiency virus photos aids photos aids virus photos immune system photos t cells photos infections photos t lymphocytes photos t-lymphocytes photos acquired immune deficiency syndrome photos t-cell photos

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Color enhanced transmission electron micrograph of HIV Viruses infecting a T-4 lymphocyte. Human Immunodeficiency virus (HIV) is the causative agent of AIDS. HIV is spread through intimate contact with an infected person (sexual contact, shared intravenous needles). HIV invades the T-lymphocyte cells of the immune system, and reprograms the cells to produce HIV. AIDS develops as the bodies' immune system is destroyed and the number of T cells dwindles. Without T cells, AIDS patients have little defense against infection. 120,000x 70 mm.