“We’ve just seen these amplification events, and that’s what’s happened at the end of this year in the US,” said Erin Bromage, an associate professor of biology at the University of Massachusetts Dartmouth.
Nearly 1.2 million people were screened at airports on Wednesday alone, an air travel record for the pandemic. While the number of travelers screened on Christmas Day — 616,469 people — represents just 23% of the total screened on the same day a year ago, the figure remains worrying for officials because it doesn’t signal the end of the holiday travel rush, but a lull before travelers begin to return home.
Dr. Carlos del Rio, executive associate dean of Emory University’s School of Medicine, said if people get together they should keep gatherings below 10 people and get tested at least once, maybe twice.
“Your level of protection is as strong as your weakest link, and if there’s a weak link, then the virus is going to spread,” he told CNN. “We’ve learned how quickly this virus and how easily this virus spreads, so we have to take all the precautions possible.”
“People can still save the lives of their loved ones by practicing that social distancing and masks,” said Dr. Peter Hotez, dean of tropical medicine at the Baylor College of Medicine.
UK travelers face new US testing requirement Monday
The CDC announced Thursday passengers will need a negative PCR or antigen test within 72 hours of boarding a flight from the UK to the US, along with documentation of their laboratory results. Airlines will be required to confirm the test prior to the flight.
The order goes into effect Monday.
A couple from Durham with no known travel history, exposure or high-risk contacts tested positive for the new variant, according to the release. They are now in self-isolation.
A travel ban on all flights arriving to Canada from the UK is already in place until January 6, 2021, according to the release.
Testing on the day of departure may reduce that risk by 37 to 61%, per the paper, which has not been peer-reviewed.
Dr. del Rio was skeptical that the testing requirement would be effective, telling CNN Saturday he believed it would be better to also require a rapid antigen test at the time of boarding, and perhaps at the time of landing in the US.
One test ‘not enough’
“One test in my mind is not enough,” he said. “I think you need to do two tests at least.”
The CDC said earlier this week that the variant has not been identified through sequencing efforts in the US, but that could be because the US surveillance system established for Covid-19 hasn’t caught it yet.
It’s “highly possible” the new variant is already in the US, del Rio said, given how quickly the virus spreads.
“I want to stress to the public that rather than getting terribly concerned about this new strain, I think we need to just reinforce the restrictions we’ve been talking about,” he said, pointing to mask wearing and social distancing.
CNN’s Pete Muntean, Naomi Thomas, Eric Levenson, Elizabeth Cohen, Jessica Firger and Michael Nedelman contributed to this report.