I don't think it's been proved, but I tink the concern is that it's viewed as a matter of when not if. > The discovery of two cases of bird flu within the same

I don't think it's been proved, but I tink the concern is that it's viewed as a matter of when not if. > The discovery of two cases of bird flu within the same family in Cambodia has highlighted the concern over potential human-to-human spread of the virus, although experts have stressed the risk remains low.