Timothy Ray Brown at a press conference to announce the launch of the Timothy Ray Brown Foundation on July 24, 2012 in Washington, DC.

In the past 20 years, a handful of people have been cured of human immunodeficiency virus (HIV), the virus that causes AIDS, through intensive medical procedures. 

Several more people have received the treatment and also appear to be HIV-free, but it’s too soon to definitively declare these patients cured. For now, they’re described as being in long-term remission, and their cases are considered “possible” cures. All these patients received stem cell transplants, with cells collected either from adult bone marrow or from umbilical cord blood.

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