Bill Gates: The good news is that we're always coming up with improved vaccines.

"The good news is that we're always coming up with improved vaccines. We've gotten the cost of those vaccines over time to be half of what they were, so we even with modest increases, we can add things like HPV vaccine to protect girls and women from cervical cancer...those vaccines and getting the coverage of those vaccines up to where we were before, that's the best buy in terms of helping improve the human condition."