they don't work if you wait until somebody is in the hospital. by that time, your own immune system responded to the infection. i'm not aware how much data we have about breakthrough infections. those are mostly mild. >> and just finally, the term breakthrough infection. i was talking to your colleague about this. he hates the term breakthrough infection because his point is that they were always expected. the vaccines work primarily at the lung and that's why they prevent serious severe illness. the idea that people could carry the virus in their nose and mouth was expected. we describe this as rare. if we were to randomly swab these vaccinated people, what do you think we would actually find? >> well, i associate myself with