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So if it comes it is likely to be very dangerous, while existing human flu viri will mutate but are not likely to instantly become so different from existing lines as to be nearly as lethal.
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That does seem like a valid point. But where did the avian flu come from? It's new to birds obviously-- by what you're saying, it must have come from something else that was used to it and had immunity to it (or else we have to keep looking for other sources, ad infinitum). I wonder what that was, and if there is already immunity there, perhaps it would help us find a vaccine?