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Lester >> gabe gutierrez starting us from new york across the country this evening medical detectives are searching for the new variant, analyzing positive covid tests in dozens of labs. erin mclaughlin got access to one of them in san diego. >> reporter: tonight, the cdc and scientists at nearly 70 state and local health labs are on the hunt for omicron, sequencing 40,000 to 80,000 specimens each week. >> given what we have seen in southern africa and certainly in europe, we do expect that it is here. >> reporter: like all viruses, covid mutates. that's normal. but what has experts concerne...

That vaccinations is the key to, a, decrease the spread and decrease knew tagsz, and my god, we've been talking about this for a year and a half. the virus mutates when people get infected. it doesn't mutate in the air, so even though you've got infected and you did fine, guess what. you may very well have contributed to mutations that will be stronger, so there is no such thing as a good infection even if you survived it with minimal symptoms. >> when you say mutations that could be stronger, what exactly do you mean by that? >> well, i mean, that the omicron mutation has productsly 30 differ...

Sunday". good morning to you. what do we need to know about the omicron variance? is it more contagious, would lead to more severe disease? your thoughts? >> those above right questions. it's early enough to be sure we know the answers. that's what a lot of us are spending our time on over the last three days. i've been on zoom calls and phone calls pretty much continuously. we know this is a variant that has a lot of mutations. like 50 of them and more than 30 of those in the spike protein which is a part of the virus that attaches to your human cells if you get infected. that is a new record...

Tougher, this plan be, as you are saying to him it's not a full plan b that's been implemented.- full plan b that's been implemented. full plan b that's been imlemented. ., �* , implemented. that's right. i think as was _ implemented. that's right. i think as was just _ implemented. that's right. i think as wasjust said, - implemented. that's right. i think as wasjust said, the i implemented. that's right. i l think as wasjust said, the aim think as was just said, the aim of these restrictions is to buy time, and they need to buy time because nobody knows just what this virus might be able t...

>> blocking travel from a given country, just give us time to assess it better, that's the reason for doing that, not any reason for panic, but we want time to fill in the blanks of what we don't know right now. reporter: while the omicron variant is officially detected in the us researchers believe the ability to enter human cells means the variant is likely already here. >> i would not be surprised if it is. we have not detected it yet, but when you have a virus that is issuing this degree of transmissibility and you already have travel related cases that they have noted in israel and belgiu...