Bird flu is 'only three steps' from mutating into deadly new form that could cause human pandemic - and scientists are scrambling for new vaccines

Bird flu is 'only three steps' from mutating into deadly new form that could cause human pandemic - and scientists are scrambling for new vaccines | Mail Online: "As scientists delve deeper into H5N1 bird flu, they have discovered it is only three steps away from mutating into a potentially lethal human pandemic form. The find has added new urgency to scientists' quest for a way to prevent a deadly global outbreak that could kill millions."