we can do serial testing of someone who is positive, the quicker they are negative and can be back to their normal life. all of that i think will make testing something that becomes part of our life once we get enough supply. it's the supply constraint that hampers the way we have used these tests. they've been been valued for what they can be able to do in the face of this pandemic. >> i do want to ask you this, the fda may soon allow pfizer boosters for kids between the age of 12 and 15. you have said to us even in the last couple of weeks that you do not see a need for boosters unless people are at high risk. so what do you think about this move? would you get your 12-year-old boosted? >> i don't have any children, but if my child was high risk, meaning immunocompromised, had congenital heart disease, a transplant, yes, i would get them boosted, if they had asthma. for the average healthy 12 to 15-year-old, for the average healthy adult i still think that boosters provide a transient benefit and there's not any