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Called HIV-1: Human immunodeficiency virus type 1. HIV-2 was discovered in 1985 . Causes severe immune deficiency leading to susceptibility to opportunistic infections and neoplasms. Transmitted by three major pathways: Perinatal. Parenteral. Sexually (70% of all transmissions) Global summary of the HIV and AIDS epidemic, December 2005. Global estimates for adults and children end 2005. People ... ................
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