CDC Director Julie Gerberding and Ron DeHaven, administrator of the Animal and Plan Health Inspection Service at the Agriculture Department, testify before the Senate Agriculture, Nutrition and Forestry Committee about the dangers of avian influenza during a hearing on November 17, 2005, on Capitol Hill in Washington. Commonly called bird flu, the disease has the potential to kill millions of people and the Senate committee is looking at the role of U.S. agriculture in the fight against its spread. (UPI Photo/Roger L. Wollenberg)