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I think that this link might be better , this is the same site but i actually found the exact page.
http://www.bbc.co.uk/health/conditions/birdflu1.shtml
this will tell the the relevent facts of...

OK Bird flu the thing thats most likely to wipe man off the face of the earth. More information on http://www.bbc.co.uk/sn/tvradio/programmes/horizon/broadband/tx/pandemic/

And a little history...