quickly or they are warranted. right. time will tell. elizabeth cohen and david mckenzie, thank you. here to discuss more about this, dr. paul sacks, professor of medicine at brigham and women s hospital and harvard medical school. dr. sacks, thank you for being with us. we appreciate your time this morning. so we re hearing from experts, they re concerned about the mutations, they re concerned it could evade immunity, that it could be more transmissible. what are your concerns as you re getting this information and how should we be thinking about this. well, jessica, you outlined two of the most important things, whether it is more transmissible, which delta was, and whether it evades the immune system, which will have implications for how effective our vaccines are. it has there is a third issue whether it causes more severe disease and that is very, very hard to determine. not just at this point, but in general. so far the variants have not conclusively shown that the
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