point of understanding will our existing vaccines work on this new variant. >> doctor, given what we know already, and of course that is going to be the major question, how they respond to the vac vaccines, but given what we know in terms of all these mutations, early signs of perhaps -- about their transmissibility, what concerns you the most in these early hours? >> well, it's the combination of these two things because if it, in fact, is a lot more transmissible, it could displace even the really contagious delta variant. if, in fact, it does evade the protection of our vaccines, then we may need to start over with our vaccination campaign, which is something that no one wants to consider. i'm going to say as someone who has lived in and worked south af africa, we should thank the south african scientists coming out so quickly and transparently with this information because i would allows the rest of the