HIV-1 and HIV-2, the agents that cause
AIDS
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Retroviruses Retroviruses Retroviruses The genome of retroviruses consists of RNA not DNA. HIV-1 and HIV-2, the agents that cause AIDS, are retroviruses. In February 1997 it was reported that pig cells contain a retrovirus capable of infecting human cells (at least, in vitro). This is troublesome because of the efforts