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Human immunodeficiency virus (HIV) infection

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HIV and AIDS fact sheet - Health conditions Directory.

The human immunodeficiency virus (HIV) is the virus that can result in Acquired Immune Deficiency Syndrome (AIDS) if left untreated. People who are infected with HIV are said to be HIV positive, even if their infection has not resulted in AIDS.

Over time if left untreated (usually many years), HIV can affect a person's immune system, leaving the body less able to protect itself from disease. When the immune system has been badly damaged by HIV infection, people can get sick from related infections or cancers. At this stage of HIV infection, a person is said to have AIDS.

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Last updated: 5 June 2023

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