Going viral: Infectious disease in the 21st century

Public health experts warn the 21st century could see unprecedented challenges in fighting infectious diseases. The ubiquity of world travel means epidemics can become pandemics with ease, and the development of antibiotics has, perversely, catalyzed the rise of "superbugs" that resist treatment. How can governments, with competing interests and ideologies, work alongside scientists and health workers to mitigate risk? Health officials from around the world discuss how they're preparing for the next big outbreak.