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Jha on the travel bans. >> travel bans help a little, not a lot. i think the travel ban will slow spread into america probably by a week or ten days. im worry about the signal it sends. we dont know if it started in south africa. they identified because they have a fabulous testing infrastructure. we dont want to create incentives against people reporting information. at most it will help on the margins, give us a few more days to prepare for what is coming. >> sarah, we know that cdc researcher...

Travel ban that president biden just announced in the past hour? >> you know, the evidence on travel bans is pretty straightforward which is they help a little, not a lot. i think this travel ban will slow spread into america probably by a week or ten days. im worried about the signal it sends. we have no idea if this variant started in south africa. we know they identified it because they have a fabulous testing infrastructure that finds it. we dont want to create incentives against people repo...