of course i agree with dr. blackstock's assessment completely. and i'm afraid that as schools open more and more across concentrated areas of the country, large population centers, we're going to see more rotation of virus through the community, through the households and back into the schools over and over and over again. wherever there are relaxations in mask-wearing policies and wherever overall community vaccination rates are low. what we see across america is really big geographic differences in the distribution of vaccine use and in the willingness to abide by community protection measures, such as wearing masks. so, i think we're going to see a really differentiated, fragmented epidemic with totally different dynamics from one part of the country to the other. and this is all going to be based on politics.