Ray Suarez reports on the H1N1 influenza outbreak, examining the ways that the U.S. and world governments are fighting it, the development of a vaccine and how it compares to such past pandemics as the 1918 flu pandemic, which killed an estimated 50 to 100 million people. Also recalled is the 1976 swine-flu scare and the associated vaccine's dangerous side effects. The documentary features interviews with health officials, including Dr. Nancy J. Cox, director of the CDC's influenza division.