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And here in the u.s. authorities are upping their surveillance at four of the busiest international airports. jfk, newark, atlanta and san francisco. and also they are now analyzing one in seven of all positive tests, looking for variants. nick watt, cnn, los angeles. >> thanks for that, nick. the experts have been telling us for months now that unvaccinated populations and immunocompromised actually are breeding grounds for these variants. it's time for three questions in three minutes. let's bring in dr. suzanne a hill, airway surgeon at columbia university medical center. so nice to see...

Mutations than delta. what risks does the more mutated strain pose to the public? >> there's just more chances that those mutations could confer some increased transmissibility or increased disease with the mutations the virus has. but we don't know these mutations necessarily make the disease that much more transmissible. it appears that it probably does, but we don't know that for sure. and we don't know that it causes severe disease. it appears that the case reports we're getting suggest mal-disease but that is not substantiated yet either. >> a lot to unpack here, a lot to -- a wait and se...

Rewarding them in the end for being brave and for facing their fears potentially of getting a shot. all those things are really helpful. >> our deal at my house is a bag of gummy bears when it's all over. that's the bribery i'm using. that's all they need. thanks so much, dr. suzanne a hill. nice to citi you this morning. thanks. >> you bet. the potential rollout of vaccines for young children has public health groups concerned about protests exaand threats t their public safety. they are asking the justice department to help keep local health department workers safe. experts say some of the...