Support WBURResearch Moratoriums And Recipes For Superbugs: Bird Flu In 2012Play04:40Download AudioNell GreenfieldboyceDecember 31, 2012 ShareResearchers at the U.S. Geological Survey National Wildlife Health Center in Madison, Wis., use eggs to see if the Asian strain of the H5N1 bird flu virus has entered the U.S. in this photo from 2006. (AP)
