Acquired Immune Deficiency Syndrome (AIDS) is caused by the Human Immuno deficiency Virus (HIV). The history of HIV/AIDS began in about 1969, when HIV likely entered the United States through a single infected immigrant from Haiti.1 In the early 1980s, doctors in Los Angeles, New York City, and San Francisco began seeing young men with Kaposi's Sarcoma, a cancer usually associated with elderly men of Mediterranean ethnicity.