enough, that would make us more safe from the evolution of, yet, more lethal, yet, more scary variants. but if vaccination doesn't reduce the amount of virus in our noses. if vaccination doesn't prevent us from being able to pass the infection to other people, is it still true? should we still understand that vaccinating a larger and larger proportion of the population is our best path toward heading off the prospect of the lambda variant or other, even scarier variants that might emerge from this virus, in the future? >> great question, rachel, and the answer to the question is, absolutely, vaccination will prevent that. it will go a long way to preventing that because, remember, when you get vaccinated, even though you get breakthrough infection, the overwhelming majority of the people don't even get infected.