The closely mutated new coronavirus variant was in Europe a number of days sooner than beforehand recognized, well being officers mentioned Tuesday, and the variety of nations the place it has been discovered elevated to not less than 20, elevating questions on whether or not the pandemic is about to surge as soon as once more.

The Netherlands’ National Institute for Public Health and the Environment mentioned that samples taken on Nov. 19 and Nov. 23 — earlier than the Nov. 24 announcement of Omicron’s existence — examined optimistic for the variant. Health officers have notified the 2 contaminated folks and are doing contact tracing to attempt to restrict the unfold.

Mutations within the Omicron variant strongly recommend that it’s extra contagious than earlier types of the virus, scientists say. They warning that they can’t be certain with out extra testing and information, however the proof to this point is sobering.

Late Tuesday night time, the U.S. Centers for Disease Control and Prevention mentioned it deliberate to toughen coronavirus testing and screening of individuals flying to the United States by requiring all worldwide passengers to supply a unfavorable consequence from a take a look at taken inside 24 hours of departure.

“C.D.C. is working to modify the current global testing order for travel as we learn more about the omicron variant,” mentioned an company spokesman, Jason McDonald.

The concern is that the present guidelines, which permit absolutely vaccinated folks to take a take a look at as much as three days earlier than departing on a flight to the United States, may not be stringent sufficient.

A day after warning that the chance from Omicron was “very high,” the World Health Organization on Tuesday mentioned that unvaccinated people who find themselves over age 60, are sick or have underlying well being dangers “should be advised to postpone travel.” In Greece, the prime minister introduced that Covid vaccinations can be compulsory for folks age 60 and older, and that those that did not guide a primary shot by Jan. 16 would face fines.

In South Africa, the place the variant was first introduced and is already widespread, reported new coronavirus circumstances have rocketed from about 300 a day in mid-November to about 3,000 a day, the quickest charge of improve on this planet. On two flights from South Africa to the Netherlands on Friday, simply as a cascade of bans on journey from southern Africa have been being introduced, 61 passengers examined optimistic for the virus, not less than 14 of them for Omicron.

In addition to the query of Omicron’s transmissibility, scientists nonetheless don’t produce other solutions the world is clamoring for: Are vaccines much less efficient in opposition to it? Are remedies? Does Omicron trigger extra severe sickness?

Experts cautioned to not put an excessive amount of inventory in experiences that the variant is inflicting solely delicate sickness, as a result of the info remains to be sparse. Early proof from South Africa signifies that Omicron, greater than earlier variants, is infecting individuals who had already had Covid-19, however that, too, requires rigorous testing.

“It’s going to be two to four weeks, possibly a bit sooner,” earlier than preliminary solutions can be found, Dr. Anthony S. Fauci, the highest U.S. infectious illness skilled, mentioned Tuesday at a White House briefing.

As of Tuesday night, no Omicron circumstances had been reported within the United States, although the variant has been detected in Canada. U.S. officers say that it’s only a matter of time, and that the objective ought to be to sluggish its unfold.

Brazilian media reported Tuesday that the variant had turned up in Brazil, which might imply it’s already on each continent however Antarctica.

The U.S. Centers for Disease Control and Prevention is sequencing the genomes of 80,000 coronavirus samples weekly — about one-seventh of all of the optimistic P.C.R. lab exams within the nation — and can step up checks on arriving worldwide passengers, the company’s director, Dr. Rochelle P. Wollensky, mentioned on the White House.

The variant has a really massive variety of mutations not seen together earlier than, about 50, together with greater than 30 on the “spike” protein it makes use of to latch onto host cells; the spike is the first goal of the vaccines. That excessive diploma of mutation is behind the fears about Omicron, and the uncertainty over whether or not these fears are overblown.

Several instances earlier than, nations have relaxed their guard, considering that the worst of the pandemic was behind them, solely to be swamped by one other wave — most just lately the one attributable to the extremely contagious Delta variant.

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Nov. 30, 2021, 7:46 p.m. ET

Vaccine makers are already wanting into reformulating their photographs to deal with Omicron, a step that was not required for combating Delta.

And Regeneron, maker of an efficient, injected monoclonal antibody remedy for Covid, mentioned Tuesday that its remedy may not work as effectively in opposition to Omicron. A U.S. Food and Drug Administration advisory panel on Tuesday beneficial approval of an oral remedy to cut back the severity of Covid, made by Merck, and can quickly contemplate one other from Pfizer.

In earlier waves of the pandemic, by the point the primary circumstances of the virus or a specific variant have been detected, in actuality there have been vastly extra and it was already widespread.

But the world’s provide of vaccines has gone primarily to the wealthiest nations, the place many individuals have now obtained three photographs earlier than the overwhelming majority of Africans have had even one. As lengthy as many individuals are unvaccinated, the pandemic will proceed and new variants will emerge.

“Vaccine equity is not charity; it’s in every country’s best interests,” Dr. Tedros Adhanom Ghebreyesus, head of the W.H.O., mentioned Monday initially of a convention supposed to supply a world treaty to coordinate illness response.

“The time has come for countries to agree on a common, binding approach to a common threat that we cannot fully control nor prevent,” he mentioned.

Vaccine doses are actually changing into extra plentiful, however African nations nonetheless face challenges in distribution and overcoming vaccine hesitancy. South Africa just lately turned away a cargo, uncertain that it may use the doses in time.

The Coronavirus Pandemic: Key Things to Know

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A brand new kind of remedy. An skilled panel voted to advocate that the F.D.A. authorize a Covid capsule from Merck for high-risk adults, the primary in a brand new class of antiviral medicine that would work in opposition to a variety of variants, together with Omicron. The capsule might be approved inside days, and accessible by 12 months’s finish.

The new variant was first present in Botswana on Nov. 11 and days later in neighboring South Africa, the place its genome was sequenced by scientists who introduced its existence two weeks later. Researchers in South Africa have discovered it in samples from as way back as Nov. 9, and specialists have mentioned it was doubtless that additional testing of outdated samples would present that it was circulating even earlier.

In Europe, the variety of circumstances confirmed is small to this point, underneath 100, however officers are bracing for extra.

“Is there likely to be community transmission?” Sajid Javid, the British well being secretary, mentioned at a information convention. “I think we have to be realistic: There is likely to be, as we are seeing in other European countries. We would expect cases to rise as we now actively look for cases.”

The timing is dismal for a continent already gripped by the most important pandemic wave but, forcing governments to drastically reduce plans to stay open for the vacations.

European nations are reporting greater than two million new coronavirus circumstances every week, greater than half the world’s whole, though with vaccinations and improved remedies, deaths have declined in contrast with a 12 months in the past. Germany, the Netherlands, Belgium, Hungary, the Czech Republic, Slovakia, Denmark and Norway all set data for brand spanking new circumstances final week; a number of others hit new highs earlier in November.

Governments within the United States, Europe and elsewhere have barred entry by folks — normally apart from their very own residents — who’ve just lately been in South Africa and a number of other neighboring nations.

But the expertise of the 2 flights that arrived in Amsterdam on Friday night time from South Africa reveals how late such measures may be.

With the journey ban taking impact, all of the passengers have been examined, and a couple of in 10 had the virus; what number of different contaminated vacationers have gone undetected is anybody’s guess.

Not solely did 14 of the passengers from South Africa have the Omicron variant — which was not but recognized to the world once they took off — however in addition they had a number of totally different variations of it, the Dutch public well being institute mentioned.

“This means,” it mentioned, “that the people were very probably infected independently from each other, from different sources and in different locations.”

Reporting was contributed by Cora Engelbrecht, Noah Weiland, Rebecca Robbins, Carl Zimmer, Megan Specia, Mark Landler, Michael D. Shear and Sheryl Gay Stolberg

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