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Replication of immunodeficiency virus in humans

The acquired immunodeficiency syndrome (AIDS) pandemic is caused by the human immunodeficiency virus (HIV-1), which attacks the immune system and leaves infected individuals susceptible to opportunistic infections. AIDS and HIV-1 are thought to have a relatively short history in humans, with the first infections likely occurring around the turn of the 20th century.

HIV-1 is derived from highly related simian immunodeficiency viruses (SIVs) that infect modern primates, including chimpanzees. SIVs must have crossed the species barrier to infect humans at some point in the past, but the molecular adaptations that permitted a new host are unknown. Drs. Beatrice Hahn and Frank Kirchoff led an international research effort to understand what adaptations allow a chimpanzee strain of SIV to replicate in human tissues.

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