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    What to know about latest strain of Covid

    Screenshot_1.jpg Less than a week after the first case of the coronavirus omicron variant was confirmed in the U.S., about a third of states have now reported cases and health officials say it continues to spread rapidly across the country.

    Although early indications suggest the omicron variant may be less dangerous than the highly infectious delta variant, scientists say there is still much to learn.

    “We have really got to be careful before we make any determinations that (omicron) is less severe or it really doesn’t cause any severe illness, comparable to delta," Dr. Anthony Fauci, the nation's leading infectious disease expert, told CNN's “State of the Union Sunday."

    The variant was first identified in South Africa, where it's quickly becoming the dominant strain, and was designated as a "variant of concern" by the World Health Organization.

    Here’s everything to know about omicron and why Americans should take notice.

    What is omicron?

    The World Health Organization designated the B.1.1.529 variant a “variant of concern” Nov. 26 and named it omicron after the 15th letter of the Greek alphabet.

    WHO uses the Greek alphabet as a variant classification system to simplify understanding and avoid stigmatizing countries where they’re first identified.

    Omicron, which can be pronounced both ä-mə-ˌkrän or ō-ˈmī-(ˌ)krän, according to Merriam-Webster, was first identified in South Africa on Nov. 24. The U.S. began restricting travel from South Africa and several other countries last week but Fauci said the Biden administration is considering lifting those bans.

    “Hopefully we’ll be able to lift that ban in a quite reasonable period of time,” he said. “We all feel very badly about the hardship that has been put on not only on South Africa but the other African countries.”

    Omicron:How it got its Greek name and what it means

    What are the symptoms?

    WHO says there’s no evidence to suggest that symptoms linked to omicron are different from those caused by other variants.

    Dr. Angelique Coetzee, a private practitioner and chair of South African Medical Association, was one of the first doctors in South Africa to detect the new variant.

    She told Reuters symptoms of the omicron variant were "very mild" and could be treated at home. These infections were first reported in university students who were younger and tended to have milder disease.

    But like all coronavirus variants, WHO said, omicron may be capable of causing severe disease or death, particularly among vulnerable populations.

    Symptoms of COVID-19 caused by any known coronavirus variant can include fever or chills, cough, shortness of breath, fatigue, muscle or body aches, headache, sore throat, a loss of taste or smell, sore and congestion or runny nose.

    How serious is omicron?It will take weeks to understand new COVID-19 variant, experts say.

    Where is first case of omicron in the United States?

    A person in California became the first in the U.S. to have an identified case of the omicron variant, the White House announced Wednesday.

    “This is the first case of COVID-19 caused by the omicron variant detected in the United States,” Fauci said at the White House last week. He said the person was a traveler who returned from South Africa on Nov. 22 and tested positive on Nov. 29.

    On a visit to the National Institutes of Health Thursday, President Joe Biden urged Americans to get behind his plan to combat COVID-19 during the winter months, which included tighter travel rules, free at-home tests and boosters shots.

    "It's a plan that I think should unite us," Biden said. It "pulls no punches in the fight against COVID-19."

    Where else has it been detected?

    At least 16 states have reported omicron cases: California, Colorado, Connecticut, Hawaii, Louisiana, Maryland, Massachusetts, Minnesota, Missouri, Nebraska, New Jersey, New York, Pennsylvania, Utah, Washington and Wisconsin, according to a Reuters tally.

    The World Health Organization said Friday the latest strain has been detected in at least 38 countries, including South Africa, Portugal, Canada, Australia, Belgium, Botswana, Hong Kong, Israel, Germany, and Saudi Arabia.

    Sign up for USA TODAY's Coronavirus Watch free newsletter to receive updates directly to your inbox and join our Facebook group.

    Should I be concerned about it?

    In a media briefing last week, President Joe Biden said omicron is “a cause for concern, not a cause for panic.”

    It’s not clear whether infection with omicron causes more severe disease compared to infections with other variants, WHO said.

    It’s also unclear how well the virus evades immunity from previous infection or COVID-19 vaccines to cause a breakthrough infection.

    But even with so little information, health experts say people should be watchful.

    “Americans should take this variant seriously," Swann said. "Even if this one turns out to be not as bad as we fear, there will be another one that will.”

    President Biden:Omicron 'a cause for concern, not a cause for panic'

    Are there any deaths linked to omicron?

    As of Monday, no deaths were reported associated with the new variant.

    What makes omicron different from other variants?

    Omicron appears to have about 30 mutations in on the coronavirus’ spike protein.

    Out of the approximately 30 mutations, 26 are unique to omicron and don’t appear in other variants of concern, according to Dr. Venky Soundararajan, co-founder and chief medical officer at nference, a data analytics firm in Massachusetts.

    In comparison, the alpha variant has only four unique mutations, beta has six, gamma has eight and delta has seven.

    “I’m less concerned about the fact that these mutations exist and I’m more concerned about the fact that we know very little about many of them,” Soundararajan said.

    A handful of omicron’s mutations that exist in other variants have been associated with previous surges of positive COVID-19 cases, he said. Some of these mutations are believed to increase transmissibility while others may help the virus evade immunity.

    Most of these mutations are clustered at the ACE2 receptor and antibody binding sites, Soundararajan said, which are also sites targeted by the COVID-19 vaccines and antibodies.

    The most intriguing mutation is the ins214EPE insertion, he said. This addition introduces three new amino acids, corresponding to nine nucleotides, to the virus’s genetic profile.

    However, that doesn’t necessarily mean the insertion is more dangerous. A preprint study, not yet peer-reviewed, authored by Soundararajan shows this same insertion is present in seasonal coronaviruses.

    This could mean the virus transmits more easily, he said, but it could also mean it causes only mild or asymptomatic disease to evade detection.

    “In evolution, when you see a virus pick up a trait, it loses something else. You may see higher transmission but lower odds of hospitalization,” Soundararajan said. “That might be the silver lining.”

    How quickly could it spread?

    Scientists say more data is needed to determine severity of illness, but real-world evidence suggests omicron may be highly transmissible.

    Dutch health authorities said they detected more than 60 COVID-19 cases among 624 passengers who flew on two flights from South Africa to Amsterdam’s airport, Reuters reported, despite requiring a negative test or proof of vaccination.

    “The filtration on planes are better, there tend to be mask requirements and most airline companies are requiring a negative test, so I would not have expected this level of positivity so quickly on that flight,” Swann said. “I found it a bit worrisome.”

    Do the COVID-19 vaccines protect against omicron?

    Dr. Anthony Fauci, the nation’s leading infectious disease expert, told Biden he believes “existing vaccines are likely to provide a degree of protection against severe cases of COVID,” reiterating that booster shots on top of full vaccination will provide stronger protection.

    However, other scientists say it will likely take weeks to sort out if the new variant is more infectious and if vaccines are still effective against it.

    COVID-19 vaccine developers with authorized shots in the U.S. – Pfizer-BioNTech, Moderna and Johnson & Johnson – have all pledged to reformulate their shots to protect against omicron “if needed,” which may include an omicron-specific booster.

    “It is imperative that we are proactive as the virus evolves,” Stéphane Bancel, Chief Executive Officer of Moderna, said in a statement. “The mutations in the omicron variant are concerning and for several days, we have been moving as fast as possible to execute our strategy to address this variant.”

    What precautions should I take?

    Preliminary evidence suggests there may be an increased risk of reinfection with omicron compared to other variants of concern, according to WHO, but more information is needed.

    Biden urged the public to get fully vaccinated, and if eligible, to get a COVID-19 booster as soon as possible. Waning immunity in people who received their first shots more than six months ago may put them at risk of breakthrough infection.

    The CDC updated its guidance, recommending that all adults 18 and older should get a booster shot either six months after their initial Pfizer-BioNTech or Moderna vaccine series or two months after their initial J&J vaccine.

    “If you are 18 years and over and got fully vaccinated before June 1, go get the booster shot today,” Biden said. “They’re free and available in 80,000 locations coast to coast. Do not wait.”

    Anyone who gathered with non-household members over the holiday should consider getting tested for COVID-19, Swann said. She also urged anyone who has traveled away from their community to get tested.

    “That would allow us to get a handle on things,” she said. “It will continue to spread but slow it down to give us time to know what this is and what does it mean, and be prepared for it.”

    Americans should also consider wearing masks, regardless of vaccination status, especially around people with compromised immune systems who are more at risk of severe disease, hospitalization and death from COVID-19.

    Biden also pushed parents to get their children vaccinated now that the Pfizer-BioNTech vaccine has been authorized for kids 5 to 11.

    “Most of our children across America are not fully vaccinated, yet,” Swann said. “People who are not fully protected with the full recommended dosage of vaccines should take extra care in gathering with anyone outside their household.”

    Contributing: Associated Press. Follow Adrianna Rodriguez on Twitter: @AdriannaUSAT.

    Health and patient safety coverage at USA TODAY is made possible in part by a grant from the Masimo Foundation for Ethics, Innovation and Competition in Healthcare. The Masimo Foundation does not provide editorial input.

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