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Worried about those as delta. delta was a bad one. we know that. very contagious the way that particular virus rearranged itself. it was a problem. right now there's others that are always going to be on the horizon but not of huge concern. what we do see is the immunity that you have right now from the vaccinations or natural immunity should offer at least some protection against what is coming down the pike. >> we saw the studies at israel and somewhere else that it is waning but still 90% against hospitalizations and deaths. pretty good. to the book. "world war c." catchy. now, why did you ...

It's good until it isn't situation? how optimistic should we be? more vaccines? more antivirals? people going to take them? right? if approved for kids will reasonable parents feel safe about it? will unreasonable parents keep their kids from it? our top doctor sanjay gupta is here to discuss that and much more including his new book "world war c, lessons from the covid-19 pandemic, and how to prepare for the next one." yes, amen. for finally taking us through what should have been done, which was done in a movie ten plus years ago which is it's coming. be ready. congratulations on the book. i...

The greek alphabet. delta, then lamda, mu. there are some that look a little more concerning than others just based on the characteristics of the virus. when i talk to these virologists and i have talked to some arountd world they're not as worried about those as delta. delta was a bad one. we know that. very contagious the way that particular virus rearranged itself. it was a problem. right now there's others that are always going to be on the horizon but not of huge concern. what we do see is the immunity that you have right now from the vaccinations or natural immunity should offer at least...

>> certainly a move in the right direction. if we have good vaccines and oral medicines and use masks when we need them we'll be in good shape against covid-19. >> until we aren't. is that going to be another iteration of the same kind of it's good until it isn't situation? how optimistic should we be? more vaccines? more antivirals? people going to take them? right? if approved for kids will reasonable parents feel safe about it? will unreasonable parents keep their kids from it? our top doctor sanjay gupta is here to discuss that and much more including his new book "world war c, lessons fro...

Are overall things do seem to be headed in the right direction. plus, the possibility of an antiviral pill against covid-19 along with the prospects of having vaccinated 5 to 11-year-olds have some including the former fda commissioner scott gotleib optimistic they could be book ends to this pandemic at the very least a light at the end of what has felt like a very long tunnel. jake? >> all right. thanks so much. appreciate it. joining us now to discuss cnn's chief medical correspondent dr. sanjay gupta also the author of the brand new excellent book "world war c, lessons from the covid-19 p...