It's been suspected that some people have a natural immunity against the virus, or rather immune systems that can successfully fight it off, but this is the first case in which it has been shown under controlled conditions (meaning, no chance of mixups in the samples and results, results verified and retested under lab conditions) that it has indeed happened (all previous results were suspect as they were reported by bush hospitals in places where record keeping routines are at best suspicious and therefore there was no guarantee that the infected and free samples were indeed from the same person).
IF this is indeed a case of a person fighting off the virus successfully (rather than a bodged test, which is still being verified) AND the person is willing to cooperate in further research this could according to an expert who talked to the Beeb last weekend potentially lead to a vaccine or some other treatment but don't hold your breath as it will take years at least.
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duckman
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since Nov 2004