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'''Acquired immune deficiency syndrome''' or acquired immunodeficiency syndrome ('''AIDS''') is a [[disease]] of the [[human]] [[immune system]] caused by the human immunodeficiency virus (HIV).[1][2][3] This condition progressively reduces the effectiveness of the immune system and leaves [[individual]]s susceptible to opportunistic [[infection]]s and [[tumor]]s. HIV is transmitted through direct contact of a mucous membrane or the bloodstream with a bodily fluid containing HIV, such as [[blood]], [[semen]], vaginal fluid, preseminal fluid, and breast milk.[4][5] This transmission can involve anal, vaginal or oral [[sex]], blood transfusion, contaminated hypodermic needles, exchange between mother and baby during pregnancy, childbirth, breastfeeding or other exposure to one of the above bodily fluids.

'''Acquired immune deficiency syndrome''' or acquired immunodeficiency syndrome ('''AIDS''') is a [[disease]] of the [[human]] [[immune system]] caused by the human immunodeficiency virus (HIV).[1][2][3] This condition progressively reduces the effectiveness of the immune system and leaves [[individual]]s susceptible to opportunistic [[infection]]s and [[tumor]]s. HIV is transmitted through direct contact of a mucous membrane or the bloodstream with a bodily fluid containing HIV, such as [[blood]], [[semen]], vaginal fluid, preseminal fluid, and breast milk.[4][5] This transmission can involve anal, vaginal or oral [[sex]], blood transfusion, contaminated hypodermic needles, exchange between mother and baby during pregnancy, childbirth, breastfeeding or other exposure to one of the above bodily fluids.