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Banned air travel from the south african countries. do you think the u.s. should do that? . >> obviously as soon as we find out more information we will do it as quickly as we can. you dent want to say you are going to do it until you have scientific reason to do it. >> so if the u.s. starts to see -- yes, i know we are awaiting more information. we need to understand how this works. if the u.s. starts to see these cases of this particular strain, what immediate measures have to be taken? there is always what the uk has done, block travel from south africa and related countries.

Fauci told cnn earlier today. >> first of all, you want to find out if, in fact, it does evade the vaccines that we're doing. i mean, there's always the possibility of doing what the uk has done, namely, block travel from south africa and related countries. we don't know know that. that's something you think about and get prepared to do. you're prepared to do everything you need to do to protect the american public. but you want to make sure there's a basis for doing that, and there's what we're doing right now. >> dr. fauci also has emphasized the importance of getting boosters, which are now...