there are calls to broaden it. they made the initial steps. there are other sectors, other frontline workers like flight aten dants. you mentioned the flight delays because of staffing shortages. i think the answer is yes. there is a paradigm here that was a bit surprising. it applied to any health care worker, not just those fully vaccinated. we know if you're otherwise without serious medical conditions like cancer and you're triple vaccinated, over phenomenon you have a positive test, let's say you have no symptoms, you attempt to clear your virus within two or three days. i could see the number come down to as short as five days for those fully vaccinated, asymptomatic, as we really trend toward this new normal. but protocols and procedures on quarantining, whether it's necessary and how long is a key component of us getting back to normal. >> it seems like something that could be changing week by week as we learn more about this variant. and we do have new data on