The fight to eradicate polio in Pakistan

Polio has been eradicated in nearly every country in the world, but Pakistan and Afghanistan are facing a surge in infections. We discuss what’s driving the outbreak — and how to fight it — with Dr. Shahzad Baig, who leads Pakistan's Polio Eradication Programme; and Aidan O'Leary, director for the Global Polio Eradication Initiative at the World Health Organization.