HIV or Human Immunodeficiency:
HIV is a virus of the family Retroviridae and genus Lentivirus. There are two types of HIV: HIV-1 and HIV-2 that have only partial sequence homologies. HIV-2 is closer to SIV, the AIDS virus of the apes than is HIV-1. The majority of HIV-positive people carry the HIV-1 type.
The viral particle of 150 nanometers in diameter contains two copies of its RNA genome, 9.200 nucleotides long, encoding 19 proteins. The viral particle is itself surrounded by a lipid membrane originating from the host cell. Viral proteins are inserted into the membrane, similar to gp120, which serves as anchorage protein on the host cell.
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