Bruce Aylward: How we'll stop polio for good

Polio is almost completely eradicated. But as Bruce Aylward says: Almost isn't good enough with a disease this terrifying. Aylward lays out the plan to continue the scientific miracle that ended polio in most of the world -- and to snuff it out everywhere, forever.

Bruce Aylward is a Canadian physician and epidemiologist who heads the polio eradication programme at WHO, the Global Polio Eradication Initiative (GPEI).