Timothy Ray Brown is believed to be the only person ever to be cured of the AIDS causing virus, HIV.

Once known as "The Berlin Patient", Brown was cured when doctors attempting to cure his luekemia infection, which he was additionally diagnosed with, unintentionally used the bone marrow of a donor with a rare gene mutation.

Brown's cells have been HIV-resistant ever since, but this also brought him unintended celebrity.

Feeling a sense of responsibility towards others still infected, he now spreads his story and allows his body to continually be tested to further HIV/AIDS research.

Al Jazeera's Kimberly Halkett reports from Washington.