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When HIV exploded in the 1980s, scientists had no idea what was making patients so sick. So, what have scientists figured out since then? We explain.

USA TODAY

Timothy Ray Brown, the first person known to have been cured of HIV infection, says he is now terminally ill from a recurrence of the cancer that prompted his historic treatment 12 years ago.

Brown, dubbed “the Berlin patient” because of where he lived at the time, had a transplant from a donor with a rare, natural resistance to the AIDS virus. For years, that was thought to have cured his leukemia and his HIV infection, and he still shows no signs of HIV.

But in an interview with The Associated Press, Brown said his cancer returned last year and has