A patient in the UK is in remission from HIV after a stem cell transplant - becoming only the second case of its kind.
He was being treated for cancer, and received chemotherapy as well as a transplant from a donor resistant to HIV.
The London Patient has now had no detectable HIV for 18 months, despite no longer taking drugs to fight it.
A decade ago a patient in Berlin also went into HIV remission after similar treatment.
UK correspondent Olly Barratt says doctors hope it will help them develop new HIV protocols.
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