they work incredibly well for that make no mistake. >> dr. collins, before i let you go to follow up on something you said earlier, i thought you said parents masking at home with children. did you mention something about that? can you tell us about when that should be occurring? >> well, again, look at cdc's recommendation. if you are parents who have small children under 12 at home, they are susceptible for getting infected. if parents are out and about and might themselves be carrying the virus, you don't want to pass that along. many parents with that recommendation consider wearing masks for families at home to reduce this risk as long as the kids are unvaccinated especially if you're in a community with high transmission at the present time. >> dr. collins, thank you so much. you've been generous with your