now who are hesitant to get their kids vaccinated? the younger kids? obviously it is 12 and up, that's approved in the u.s., but there is a lot of discussion among parents about what to do. >> yes, and to be fair urich ri, you're right, i didn't answer the question. i think we're dedicated to the goal and to being honest and transparent n terms of kids, i want to wait and see, let's wait and see what the fda and cdc says. these bodies are independent, data-based, scientific, they are -- they will tell us after the trials for kids what they recommend. and, you know, there is no way they're going to recommend vaccine for children unless they are absolutely confident that it is safe and the right thing to do. for most americans, if it is approved, they will want to vaccinate their kids. but we ought to wait and see because these processes are supposed to work for us. >> i want to go back to your book, preventable, as you wrote