defined:

AIDS was first reported in 1981 in the United States and has since become a major epidemic, killing nearly 12 million people and infecting more than 30 million others worldwide. The disease is caused by HIV, a virus that destroys the body's ability to fight infections and certain cancers.

explained:

Listen to a detailed explanation.

Dr. Richard Morgan, formerly of the National Human Genome Research Institute's Clinical Gene Therapy Branch, defines human immunodeficiency virus (HIV)/acquired immunodeficiency syndrome (AIDS).

illustrated:

View illustration

related
terms:

cell, retrovirus

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