On October 26, 1976, the last case of Smallpox occurred, ending a ten-year struggle to eliminate a disease that had annually killed two million people or more. We’ll spend this hour with Dr. D.A. Henderson, the physician who led the campaign. He tells the story in a new book – “SMALLPOX – THE DEATH OF A DISEASE: The Inside Story of Eradicating a Worldwide Killer ” (Prometheus, 2009).