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.

For just a few dollars a dose, vaccines save lives and help reduce poverty. Unlike medical treatment, they provide a lifetime of protection from deadly and debilitating disease. They are safe and effective. They cut healthcare and treatment costs, reduce the number of hospital visits and ensure healthier children, families and communities.

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.

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.

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.

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