By Michael Balsamo and Zeke Miller

A person in California who had been vaccinated against COVID-19 became the first in the U.S. to have an identified case of the omicron variant, the White House announced Wednesday as scientists continue to study the risks posed by the new virus strain.

Dr. Anthony Fauci told reporters the person was a traveler who returned from South Africa on Nov. 22 and tested positive on Nov. 29. Fauci said the person was vaccinated but had not received a booster shot and was experiencing “mild symptoms.”

The Biden administration moved late last month to restrict travel from Southern Africa where the variant was first identified and had been widespread. Clusters of cases have also been identified in about two dozen other nations.

“We knew that it was just a matter of time before the first case of omicron would be detected in the United States,” Fauci said.

He said the person was improving and added, “I think what’s happening now is another example of why it’s important for people to get vaccinated. But also boosting. Boosting is very important.”

Officials said they had contacted everyone who had close contact with the person and they had all tested negative.

Genomic sequencing was conducted at the University of California, San Francisco and the sequence was confirmed by the Centers for Disease Control and Prevention.

The Centers for Disease Control and Prevention is taking steps to tighten U.S. testing rules for travelers from overseas, including requiring a test for all travelers within a day of boarding a flight to the U.S. regardless of vaccination status. It was also considering mandating post-arrival testing.

Officials said those measures would only “buy time” for the country to learn more about the new variant and to take appropriate precautions, but that given its transmissibility its arrival in the U.S. was inevitable.

Much remains unknown about the new variant, including whether it is more contagious than previous strains, whether it makes people more seriously ill, and whether it can thwart the vaccine. Fauci, the top U.S. infectious disease expert, said more would be known about the omicron strain in two to four weeks as scientists grow and test lab samples of the virus.

California’s Department of Public Health credited the state’s “large-scale testing and early detection systems” for identifying the case.

“We recognize that everyone is exhausted, and the news of a new variant can be overwhelming. It is important that we collectively focus on the things we know prevent the spread of COVID-19, and its variants,” state public health officials said in a statement.

The announcement of the first U.S. case comes before President Joe Biden plans to outline his strategy on Thursday to combat the virus over the winter. Biden has tried to quell alarm over the omicron variant, saying it was a cause for concern but “not a cause for panic.”

Biden and public health officials have grown more urgent in their pleas for more Americans to get vaccinated — and for those who have been vaccinated to get booster shots to maximize their protection against the virus.

Updated on December 1, 2021, at 3:45 p.m. ET with the latest details.

Share:
More In Science
Polar Bears International Calls on World Leaders to Take Real Steps on Climate Crisis
Alysa McCall, director of conservation outreach and staff scientist at Polar Bears International, joined Cheddar to discuss the ongoing fight to protect polar bears from extinction while world leaders gathered to discuss the climate crisis. McCall explained her organization's mission "to ensure the long term survival of polar bears by helping ensure their arctic sea ice habitat remains intact." McCall said she hopes actionable steps are taken after the UN climate summit to mitigate the crisis and not just more promises.
Moderna Reports Major Miss on Q3 Earnings
Moderna reported a massive miss on revenue in its Q3 earnings, taking in $5 billion versus the expected $6.21 billion despite sales of the COVID-19 vaccine. The pharmaceutical giant's stock dropped sharply on the news.
GOP Stunner, Vax for Kids Approved & Braves Win!
Carlo and Baker discuss the election results across the country, including a Republican comeback in Virginia -- and possibly NJ -- plus the CDC gives the go-ahead for child vaccinations, Atlanta wins the World Series and more.
CDC Advisory Panel Recommends Pfizer Vaccine for Children Ages 5 to 11
Dr. Julie Morita, executive vice president of Robert Wood Johnson Foundation, joined Cheddar to discuss the CDC advisory panel recommending the Pfizer vaccine for children ages 5-11. "We've seen many millions of children getting sick, many hospitalized, many dying because of COVID," Morita said. "And so now we have a new tool that we can use to keep our children safe." She also noted that hesitancy among parents about vaccinating their children will likely fade in time as the childhood vaccine program gets underway.
Biden Announces New Methane Regulations With Goal of Slashing Emissions 30% by 2030
President Joe Biden introduced the Global Methane Pledge on the second day of the United Nations climate summit. The U.S. and the European Union will lead the way when it comes to methane emissions reductions, and close to 100 nations have also signed on. It's seen as the fastest way to slow down global warming and keep nations on track toward meeting the goal of keeping warming just 1.5 degrees Celsius above late 1800s atmospheric levels. Dr. Sweta Chakraborty, U.S. President of climate-focused startup 'We Don't Have Time' joins Cheddar Climate to discuss the importance of the Biden administration's methane regulations -- and the importance of U.S. leadership when it comes to climate issues.
Sunrise Movement Youth Activists Call on Biden to Follow Through on Climate Promises Amid COP26
John Paul Mejia, the national spokesperson for the Sunrise Movement, joined Cheddar to talk about what the youth activist group wants to see from President Joe Biden as he attends the COP26 climate summit. Mejia admonished the president for having little to deliver on his own climate agenda domestically while at the conference. "We need the president to follow through with his promises because, frankly, it's a matter of life or death not only for communities here in the United States but also those looking to us around the world," he said.
ESG Investing in Focus at COP26
With COP26 kicking off, roughly 120 world leaders and delegates are in Glasgow, Scotland to hold climate talks this week. As experts continue to warn about the dangers of climate change, ESG investing is more important than ever. Georges Archibald, Head of Apex Americas at Apex Group joined Cheddar's Opening Bell to discuss.
World Leaders Gather For COP26
Roughly 20,000 heads of state, diplomats, and activists will gather in person starting Oct. 31 to address the threat of climate change. The summit, known as COP26, is seen as a crucial step in getting the crisis under control as scientists warn global warming is only getting worse. Carroll Muffett, President and CEO of the Center for International Environmental Law, joined Cheddar to explain the goals of COP26 and why it's so crucial for the world leaders to step up and make new, aggressive climate commitments.
Load More