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HIV The Human Immunodeficiency Viruses (HIV) are two species of Lentivirus (a subgroup of retrovirus) that infect humans. Over time, they cause Acquired Immunodeficiency Syndrome (AIDS),[1][2] a condition in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive.[3] Without treatment, average survival time after infection with HIV is estimated to be 9 to 11 years, depending on the HIV subtype.[4] In most cases, HIV is a sexually
