which is great. on the other, 99% of the country still has high transmission rates. so some states are already loosening restrictions, but the c.d.c. is not budging on their recommendations. what should someone do if their state leaders are telling them something different than the c.d.c.? >> well, the key thing now is it's not just transmission rate, it's hospitalization rate. so when there is adequate space in the hospital, when we have oral drugs like want pfizer drug and the monoclonal antibodies that work, we can lower mask mandates and go back to a new normal. the key is it's different all across the country depending on what city you live in. but transmission rates are not the only metric now. >> jiang: given how many states are now doing their own thing, do you think that puts pressure on the c.d.c. to change federal guidelines at all? >> yeah, it's difficult for the c.d.c. because there's not going to be one size fits all. what the c.d.c. needs to do is set parameters.