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Concerned that there will be a variant or a strain of covid in the near future that would be totally resistant to the vaccine? >> i'm not. and here's why. we had almost 2,000 variants. we track them -- if you want to geek out on this stuff, there's a website, nextstrain.org and that's where we watch the variants internationally and you can see there's been over 2,000. none of them have ever evaded the life protecting effect of immunity. >> there are people coming into the country through our southern border and some of them are test thing pos of testify for covid -- positive for covid and the ...
Severe and get outperformed by the more contagious strain, which is delta. given this virus made have had breaks in unnatural places -- if you go to nextstrain.org -- >> martha: we talked about in february that we thought this would reach herd immunity by april. how do you amend that now that you look at what is going on with these other variants? >> so herd immunity refers to slowing and people confuse it -- we always knew the remaining 10 to 20% of nonimmune adults would get it. delta changed that game. it accelerated that infection. we're seeing it right now.