omicron severity. two studies suggest the following. the omicron wave that's inundating many parts of the world and sparking new records may comparatively be less dangerous than delta, at least in areas with high levels of preexisting immunity. tell us what you're thinking of this skroefr seas data. is it reassuring and what does it maybe tell us? does it mean hospitalizations could stay low in the u.s. over the coming weeks? >> i'm cautiously optimistic. we literally started talking about omicron not even three weeks ago. i think this is all early. but all signs point to this being encouraging. for all your viewers, wondering how could somebody be triple vaccinated, otherwise healthy and have a positive test? it turns out the way in which our immune system and respiratory tract show is scattered, it could explain it. we don't have as many antibodies in our nose and throat, but we have a lot of them and other cells like t-cells in our lungs. what omicron has shown is it