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.

The best vaccine imaginable is only valuable to the extent we get it to everyone who needs it.

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.

The return on investment in global health is tremendous, and the biggest bang for the buck comes from vaccines. Vaccines are among the most successful and cost-effective health investments in history.

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.