HIV Type 1

Electron micrograph of an HIV-1 particle

Electron micrograph of an HIV-1 particle

Human Immunodeficiency Virus (HIV) is the virus that causes AIDS (Acquired Immune Deficiency Syndrome) in humans. HIV is a retrovirus and belongs to the lentivirus subfamily.

There 2 major types of HIV: HIV-1 and HIV-2. The majority of HIV positive humans are infected with HIV-1. HIV is closely related to the simian immunodeficiency virus (SIV), which can cause AIDS in certain species of monkeys. SIV infection of monkeys provides a valuable animal model for studying experimental vaccines and drugs.

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