u.s. now, this is going to be a test. there are some communities that have very low vaccination rates. it will be important to see what happens in communities with high vaccination rates and low vaccination rates. i hope that omicron doesn't cause the kind of damage that delta did in places with low vaccination rates. >> no question. this informs the next question which is, is it right in your view to be shortening the quarantine time for vaccinated people. uk is going from ten to seven. should the u.s. be the same or even shorter in your view? >> i would be interested to know if the cdc would consider this test-to-return program. in a way what uk is doing is test to return. meaning if you have a negative test, you no longer have virus, you're able to return back to work. that just makes sense to me. it makes sense for maintaining our workforce, but also right now what i'm afraid of is we're