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You'd like to see the definition change if this is just what the data is showing us? >> you know, kate, for me as a public health person, i just say get your third shot. forget about what the definition is. i just want to see people be optimally protected. that's what i'm concerned about. for me that's unequivocally and unquestionably getting a third shot boost. >> you mentioned that pfizer -- you said that the government is also working with moderna on continuing to still produce a variant-specific booster for omicron. why is that necessary if we're seeing that this -- that these original vac...

Emergency operation center where they are tracking covid, of course, and this new variant in the u.s. right now. and all of this as delta continues at an alarming rate. this new surge with the colder weather here. people, of course, back indoors. more than 117,000 new cases every day now. that's up 46% in a week. new hospital admissions up more than 14% from last week and in children, this was alarming, hospital admissions up nearly 37%. so, tonight here, several questions answered. what has the cdc director most concerned about this new variant, dr. jen ashton with that. and what about these ...

With the new omicron variant the initial study shows that for people with two doses of the mrna vaccine, the protection against infection -- at least laboratory data, we don't have clinical data yet -- diminishes significantly. however, as people from pfizer pointed out, when you get that third shot boost, it dramatically increases the level of laboratory projected protection. in other words, if you look at the level of antibodies and very likely other immune parameters, that you still stay within the level of protection, which is really very encouraging news because everyone obviously is conc...

To get boosted to do so. >> if you look at the peak following the third shot boost, it goes way up here. >> reporter: fauci warning not to wait for a omicron tailored booster shot. >> the mistake people make is to say let me wait and see if we get one. >> reporter: more than 20 countries detected the variant in their nation raising questions about the value of travel bans. >> no one feels, i certainly don't, that a travel ban will prevent people who are infected from coming to the united states. but we needed to buy some time. >> reporter: fauci offering this advice for americans hoping to att...

New variant. >> have they had a booster shot yet? >> to my knowledge no. >> reporter: they returned to the united states on november 22nd and tested positive a week later and isolating as close contacts are being traced and tested. >> all close contacts thus far have tested negative. >> reporter: the news coming as the cdc prepares to tighten testing restrictions on all travelers entering the united states shortening the time frame for a negative test from 72 hours to 24. >> this person, i mean, did what we hope other people would do. they got off and as soon as they became symptomatic, they w...