Doctors in Germany, who treated a man for leukemia with a bone marrow transplant, say the treatment had a very, very unexpected side effect.
Though it's supposedly an unusual case that obviously needs further investigation, the man, who also carried the HIV virus was, miraculously, cured of it.
From what we know about viruses, they can't really be cured—they can only leave your body—apparently the donor of the bone marrow, who had a genetic resistance to the virus, passed along the resistance in his bone marrow, thus curing the man of his HIV.
[BBC: Bone marrow 'cures HIV patient']
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