AIDS
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This is a syndrome that is based on evidence of human immunodeficiency virus (HIV) infection and the development of one or more of a list of opportunistic infections or malignancies for which there is no other explanation (1).

The most common of the defined diseases accounting for up to 80% of the defined AIDS cases are Pneumocystis carinii pneumonia and Kaposi's sarcoma.

The origin of HIV is unknown. The HIV-1 virus has been found in blood samples in Africa that date from the 1960's.

The incubation period from infection with the virus to development of AIDS is highly variable (approximately 1 year to 9 years).

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