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While the agency has lifted its travel health notice two years after putting it in place, officials say it's up to travelers to determine their own health risks before going aboard a ship.
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In a statement posted to Twitter, Psaki says she had two "socially-distanced meetings" with President Biden on Monday and said he was not considered a close contact. His most recent test was negative.
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The U.S. will soon mark two years since the first confirmed case of COVID-19 in the country, and the number of new infections has never been higher. Meanwhile, travelers are facing canceled flights.
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The variant caused fewer deaths and less severe infections than past versions of the virus in South Africa, but that could be different in other countries.
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The CDC revised its guidance Thursday, as 91 cruise ships are under investigation for COVID outbreaks onboard. Most cruise lines require adult passengers to show proof of vaccination against COVID-19.
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People who test positive need to isolate themselves for 5 days if they don't show symptoms. The change reflects "what we know about the spread of the virus" and vaccine protection, the CDC chief says.
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Vaccinated health care staff and other essential workers can return to work five days — rather than the previous 10 days — after a positive COVID-19 test if they meet certain safety standards.
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Several airlines are reporting staff shortages from the spread of the coronavirus, leaving passengers with delayed or canceled flights. Bad weather also affected some flights.
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In a preemptive move, United, Delta and others canceled dozens of flights scheduled for Friday. They say the omicron spike has left them with staffing shortages.
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Underscoring its high transmissibility, in a week, omicron went from a 12.6% share of new COVID infections in the U.S. to a dominant 73.2%, according to the CDC's latest estimates.
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Military officials say that, after months of warnings, they have begun disciplinary actions. The Army has reprimanded 2,700 soldiers and said it will begin discharge proceedings in the new year.
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Pfizer and BioNTech, which produced the first COVID-19 vaccine authorized in the U.S., say they will expand ongoing trials to include a third dose for children as young as 6 months old.