We've actually eliminated Type II polio in the world, at least as far as we can tell.

As variable as flu is, HIV makes flu look like the Rock of Gibraltar. The virus that causes AIDS is the trickiest pathogen scientists have ever confronted.

When it comes to providing aid, developing innovations and making bold steps that change the course of history, the United States is usually on the front lines.

As many times as [HIV] changes its clothes, it's still wearing the same socks, and now our job is to make sure we get the body to really hate those socks.

Healthy children are more likely to attend school and are better able to learn. Healthy workers are more productive. More productive economies mean greater stability in developing countries and improved security in the West.

Investments in immunization yield a rate of return on a par with educating our children - and higher than nearly any other development intervention.

Leadership is about vision and responsibility, not power.