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HIV/AIDS, short for human immunodeficiency virus infection and acquired immune deficiency syndrome, is a condition that can depress the immune system, exposing sufferers to potentially deadly infections. HIV/AIDS first passed from primates to humans in Africa in the early 20th century, and is transmitted through unsafe sex, contaminated blood transfusions, reused needles, and from mother to child during pregnancy. Since the early 1980s, HIV/AIDS has killed over 30 million people. There is no vaccine for HIV/AIDS, but the administration of antiretroviral drugs can slow the progression of the condition, allowing those infected to live much longer lives.