Bill Gates describes the Gates Foundation's new emphasis on the advancement of vaccinations to eradicate polio, which he predicts will help energize the global health system.

"In 1988 when the eradication campaign started, there were over 300,000 cases a year," says Gates. "We're down to having one percent as many cases as we had when we started, only a few thousand a year."

Bill Gates describes the Gates Foundation's new emphasis on the advancement of vaccinations to eradicate polio, which he predicts will help energize the global health system.

"In 1988 when the eradication campaign started, there were over 300,000 cases a year," says Gates. "We're down to having one percent as many cases as we had when we started, only a few thousand a year."