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Now confirmed cases in at least 20 countries. this evening the seemingly different messages from moderna and pfizer about the vaccines and how well they might protect people against omicron. tonight why the left of antibodies in your system after both vaccine shots and the booster is so important. here's abc's stephanie ramos. >> reporter: with the new variant spreading around the globe, the cdc director tonight says the country is on high alert and expanding surveillance in search of the first omicron case in the u.s. >> we have the tools and surveillance in place to identify the omicron vari...

To sell that from from bill and sell the perks of it and it's going to take time to be implemented. it does come as his top code of officials are briefing reporters on what they know about the new variant and this is something that scientists are very much evaluating and they are in touch with labs across the united states and they wait to see if this variant is here present in the united states because we know officials said they could be here and if not here yet they they could be here. they are using test samples to see if it's happened. how much it's here will be key to try to contain the ...

Emma simpson, bbc news. this is outside source live from the bbc newsroom. our lead story is — officials believe the new covid—19 variant was in europe earlier than thought. test samples show omicron cases in the netherlands 11 days ago. now to antarctica, and efforts are about to get under way to drill a narrow hole down into the ice, removing a core three kilometres long to enable scientists to learn about the earth's distant past. the samples will allow scientists to learn more about the frequency of previous ice ages as long as 1.5 million years ago. a european team is about to set up ...

Came to the netherlands over the weekend, but it now transpires that there were two test samples between the 19th and the 23rd. why am i telling you those dates? that's because south africa reported its findings, which started this omicron thing off, on the 24th. so, should you be alarmed that cases were actually in the netherlands before south africa said anything? well, no, actually, the world health organisation says they found the first in a specimen collected on the 9th of november. so, although we only heard about this the other week, it's actually been around for longer. early evidence ...

Community is prepared. over the next week or two we'll have answers to these questions. >> do you think we're doing enough testing in the united states to find out if this variant is here, and if so, how widespread it is? >> unfortunately, caitlyn, we've under performed in terms of genomic testing so far. we're doing better than before but we're not quite at that level. no, i think it's quite possible that the omicron variant is here, we haven't picked it up yet. i think if we can pick up the pace of genomic sequencing, hopefully we'll identify it soon. >> the cdc says no confirmed cases but t...