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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. i'm worry about the signal it sends. we don't know if it started in south africa. they identified because they have a fabulous testing infrastructure. we don't 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 researchers found evidence that covid-19 was in the u.s. in september 2019, weeks earlier than previously t...

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. i'm 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 don't want to create incentives against people reporting information. at most, i think it will help on the margins. might give us a few more days to ...