public health leaders that that it would drop off a chi and it would be fleeting. it turns out it was wrong. and as a result, tens of thousands of americans died over the spring because we rationed our vaccine supply accordingly. we should haved had those with natural immunity step aside as we get more vulnerable people vaccinated. paul: so are you saying that if you are a corporation now that is mandating vaccines for people whether or not they've had covid before or not, that might be overkill, that in fact, if you have had covid, you probably do not need a vaccine? >> that's exactly right. so if a corporation or university is truly following the science, they would do what we do in science and evolve our strategy as the data come in. this data is overwhelming, it'sen conclusionive, it's a large -- it's a large, sophisticated study, and it clearly shows those with natural immunity may benefit slightly from one additionals dose, but it should not be a requirement