As the anthrax attacks in 2001 made clear, the U.S. is vulnerable to bioterrorism. But which threats are real, which are exaggerated? NBC news anchor Tom Brokaw, himself a target of bioterrorism, hosts an in-depth look at the world’s deadliest pathogens: ebola, smallpox, botulism, tularemia, plague, and anthrax. With extensive archive footage and interviews, the program explores the history of these agents, the danger to America’s food supply, and lessons of Dark Winter, a simulated bio-attack. Public health officials and experts include Tommy G. Thompson, Secretary of Health and Human Services; Judith Miller, New York Times columnist and author of Germs; Randall Larsen, director of the Institute for Homeland Security; and Ann Veneman, Agriculture Secretary. A Discovery Channel Production. (46 minutes)