First we've got population. Now, the world today has 6.8 billion people. That's headed up to about nine billion. Now, if we do a really great job on … - Bill Gates

The success of the Nigeria programme hinges on the active participation of everyone to make sure that all children are reached by National Immunization Days (NIDs), Immunization Plus Days (IPDs) and the routine immunization programme, if the country capitalizes on the commitments I've heard in the past two days, Nigeria can lead the way to a polio-free Africa.

The harsh mathematics of polio makes it clear: We cannot maintain a level of one thousand or two thousand cases a year. Either we eradicate polio, or we return to the days of tens of thousands of cases per year. That is no alternative at all. We don't let children die because it is fatiguing to save them. Our commitment as a foundation is to work with partners until no children die from polio.

In the last 20 years, thanks to your hard work, polio has declined by 99 percent. In 1988, 350,000 people got polio. By 2008, the number was down to just a couple of thousand.