the pandemic has become more dangerous for children. here is how to help keep them safe. she is also the author of the new book lifelines, a doctor's journey in the fight for public health. also with us, cnn chief medical correspondent, dr. sanjay gupta. sanjay, how significant is this? i mean, talk about who is considered immunocompromised and eligible for a third shot. >> yeah. well, this is significant. i mean, we have seen this sort of play out in countries around the world and i think a lot of people have been wondering when this was likely to happen here in the united states. and it looks like it is imminent, as kaitlan just said. if the fda does go ahead and make this recommendation, it will be followed by the cdc. just like we saw with the vaccines. you remember, the fda authorized. cdc formally recommended. we see the same thing and as -- as soon after that, we could see the shots going out. maybe, this weekend or early-next week. it could be that fast. it is about 3 to 4% of the population we are talking about. 9 to 10 million people. immunocompromised means your immune system is compromised. not able to -- to sort of create