With cases of the Omicron variant rising in Europe, there are worries that even tougher restrictions are looming over a holiday period that many had hoped would be a return to some normalcy.
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LONDON — Confirmed cases of the Omicron variant surged in Britain and Denmark on Sunday, backing up scientists’ fears that it has already spread more widely despite travel bans and adding to worries of new lockdowns before the holidays.
The coronavirus variant has been found in at least 45 nations worldwide, with the United States and much of Europe reporting a number of new cases in recent days.
On Sunday, Britain’s health security agency confirmed that it had now detected 246 cases of the variant — nearly double the total number of cases reported on Friday. In Denmark, the local health authorities confirmed that there were 183 known cases of the variant, more than triple the total number of suspected cases reported on Friday, and called the figures “worrying.”
The numbers are skewed somewhat because both countries are widely seen as leaders in genomic sequencing and testing, so they are finding the variant in part because they are looking so carefully for it. And in Britain, scientists are focusing much of their genomic sequencing on international travelers and on contacts of those already infected with the Omicron variant — two groups more likely to have been exposed.
Still, the announcements make clear that the number of Omicron cases is rising quickly. What that might mean for public health remains less clear.
Many questions about the variant remain, including precisely how transmissible it is, how well vaccines will hold up against it and how likely it is to cause severe disease. There are some early signs that Omicron may cause only mild illness, though that observation was based mainly on South Africa’s cases among young people, who are less likely overall to become severely ill from Covid.
And at the moment, scientists say there is no reason to believe Omicron is impervious to existing vaccines, although they may turn out to be less protective to some unknown degree.
“We’re going to see lots of big numbers over the course of the next several weeks in countries around the world,” said Dr. Michael Osterholm, director of the Center for Infectious Disease Research and Policy at the University of Minnesota. “And this shouldn’t be a surprise. This virus is just acting like a highly transmissible respiratory virus.”
Part of the increase may be explained by the new laser focus of public health officials on the variant, which early evidence suggests may spread more quickly than the Delta variant that has been the most dominant version of the virus.
“Once you find someone who is infected,” Dr. Osterholm said, “and you start looking at their contacts or the environment they’re in, you’re just going to find a lot more.”
Dr. Peter J. Hotez, dean of the National School of Tropical Medicine at Baylor College of Medicine, said that the known numbers of Omicron cases were so small at the moment that it was hard to know how much to make of the increases in Britain and Denmark. A few hundred cases is still a “tiny fraction” of around 44,000 new coronavirus cases on average that Britain experiences daily, he said.
“I think the question people want to know is whether Omicron is going to outcompete Delta, and it’s a possibility,” he said.
For now, Dr. Hotez said, there is not enough data to conclude that. If at the end of next week Omicron represents “even 10 percent of the Delta cases, then I’ll be more concerned,” he said.
But even before the discovery of the new variant, some public health experts were raising the alarm that the travel restrictions in place in much of Europe — some of them put in place to counter Omicron — were still not enough to stem the surge in coronavirus cases already taking place.
Some lamented what they said was the cost of nations letting their guard down, criticizing the failure to reimpose restrictions like indoor mask wearing and social distancing, and to remind people to isolate if they have been exposed to the virus.
Jeremy Farrar, the director of the Wellcome Trust and a former member of the British government’s scientific advisory body, wrote in The Observer that the rise of Omicron was a signal that the “staggering progress” made since the start of the pandemic “is being squandered.” Richer nations, he argued, had a “blinkered” focus and were “lulled into thinking that the worst of the pandemic was behind us.”
“This variant reminds us all that we remain closer to the start of the pandemic than the end,” he said.
In parts of the United States, health officials have also seen a steady climb in the number of Omicron cases. The variant has been detected in at least 16 states: California, Colorado, Connecticut, Hawaii, Louisiana, Maryland, Massachusetts, Minnesota, Missouri, Nebraska, New Jersey, New York, Pennsylvania, Utah, Washington and Wisconsin.
Some Americans, too, are becoming more nervous.
“We’re paying closer attention, which we haven’t probably for a little while,” said Rory Bakke, who lives in Marin County, Calif. “It’s upped our attentiveness to the reports of symptoms and how contagious it is and the science reports.”
Ms. Bakke expressed frustration over the latest threat.
“I feel like if everyone had just followed the guidelines, we wouldn’t be in this situation,” she said. “So that’s disheartening.”
The Omicron variant was first identified in southern Africa in late November. On Saturday, Zambia became the latest African country — alongside South Africa, Botswana, Nigeria and Ghana — to report cases.
Since its emergence, a number of travel restrictions have been imposed to try to slow its spread, including in the United States and Europe.
Still, some European governments have been hesitant to impose sweeping new domestic restrictions ahead of a highly anticipated period of travel and big gatherings, especially given the lockdown in much of Europe last winter. Many have instead opted to focus on restricting travel from abroad or requiring more testing for travelers.
But some fear the travel restrictions are a case of too little too late.
“I think that might be a case of shutting the stable door after the horse has bolted,” Mark Woolhouse, a professor of infectious disease epidemiology at the University of Edinburgh who advises the government, told the BBC.
The Omicron variant. The latest Covid-19 variant was identified on Nov. 25 by scientists in South Africa and has since been detected in dozens of countries, including the United States. Should you be concerned? Here are answers to common questions about Omicron.
Understanding the mutation. Scientists in South Africa said that the Omicron variant appeared to spread more than twice as quickly as Delta and that past coronavirus infections give little immunity against it. In the U.S., sequencing labs are speeding up the screening of samples from travelers.
Travel restrictions and lockdowns. The U.S. is requiring international travelers to provide proof of a negative test taken no more than a day before their flights. In Europe, where Germany has already announced tough restrictions on unvaccinated people, worries of new lockdowns loom.
New York City’s new mandate. Mayor Bill de Blasio announced a sweeping vaccine mandate for all private employers in New York City to combat the spread of the Omicron variant. Eric Adams, who will succeed Mr. de Blasio as mayor in less than a month, declined to commit to enforcing the new rules.
He said it was “too late to make a material difference to the course of the Omicron wave.”
So far, the British government has told the public to proceed as usual with their holiday plans, though it has urged people to get booster shots. Dominic Raab, Britain’s deputy prime minister, called that the “surest defense” in a BBC interview on Sunday.
“Our message is this: Enjoy Christmas this year,” he said. “The vaccine rollout means we’re in a position to do so.”
Henrik Ullum, head of Denmark’s public health agency, said he now expects the variant to spread locally, given that 183 people already tested positive.
“There are now ongoing infection chains,” he said in a statement, where the Omicron variant is seen among people who have not been traveling or had connections with travelers.
European countries have taken steps to curb social contacts in recent days amid an overall surge in cases.
Belgium is requiring people to work from home and ordered schools closed a week earlier for Christmas; Italy banned unvaccinated people from certain leisure activities; and Ireland has shuttered night clubs and restricted gatherings.
Germany has banned the unvaccinated from much of public life. And in an indication of the severity of the situation, the German government, which had been hesitant to put in place government mandates around the pandemic because of the country’s history with authoritarianism, has plans to make vaccination compulsory next year.
Some nations have already seen pushback to the restrictions. In Austria, tens of thousands marched in protest on Saturday for the second weekend in a row over the government’s decision to impose a tough new lockdown and its plans for a vaccine mandate.
Experts had time and again have warned that not enough had been done to combat the Delta variant across Europe. This week, they reiterated those warnings and call for action.
Michael Ryan, the head of the emergencies program at the World Health Organization, speaking last week at a news conference, said European countries should have taken more precautions this autumn to protect their populations.
“We will have to be a little patient in order to understand the implications of the Omicron variant,” he said, “but, certainly we are dealing with a crisis now. And that crisis is in Europe, and it is being driven by the Delta variant.”
Now, he said, it is time for “everyone to recommit ourselves to controlling the pandemic of multiple strains or multiple variants of the same virus.”
Emily Anthes contributed reporting from New York, Thomas Erdbrink from Amsterdam, Jasmina Nielsen from Copenhagen and Holly Secon from California.
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