this decision. so you don't reach a level where you don't have enough teachers to teach the kids in school? >> i think it is an important thing to consider. i think that is part of the reason for shortening from ten to five. other reason is a recognition that with each day after five, your risk of transmitting goes down. doesn't go to zero, but goes down. and that was factored in there. we need to be able to get people to work as quickly as possible. a lot of people in our country as you know don't have sick leave, don't have medical leave, if they're out for ten days, people are going to be losing jobs. they're not going to be getting those paychecks. the build back better bill did not pass, which would have guaranteed everyone sick leave, family medical leave. we're one of the only wealthy nations that doesn't ensure that. it is not just a matter of infection control when talking about ten days of isolation versus five. for many people it is not feasible to do ten.