AIDS (Acquired Immune Deficiency Syndrome) is a disease resulting from infection by a virus known as HIV, human immunodeficiency virus. The virus attacks the human immune system, leaving the victim vulnerable to infectious diseases and some types of cancer. Several years may elapse between infection with HIV and the onset of AIDS, and in some cases the virus never develops into full-blown disease. The virus is transmitted through sexual contact with an infected person, intravenous drug use,...

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