however, we don't know which children are susceptible to these kinds of side effects from a viral infection. that's the scary thing. you don't know whether you're child will come down with multisystem inflammatory disease or something like the enreceive. we don't know which child can go that way. >> i want to turn to viewer questions. the first one here, i think this is on a lot of parents minds as they send their children to the classroom every day. dr. blackstock, what is the risked to masked elementary students in a classroom if one student has covid and refuses to wear a mask. what's the risk if that child wears a mask? >> right. such a great question. many parents have this concern. we've had some studies, especially some great studies out of north carolina that have shown that universal masking in schools keeps students safe.