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  3. Omicron, Delta, Alpha, and More: What To Know About the ...

    By January 2023, a new Omicron subvariant called XBB.1.5 was causing the most infections in the U.S. Meanwhile, experts are still learning about several newer Omicron strains circulating in the U.S., each of which, as of mid-December, were causing less than 6% of infections. They include BF.7, XBB, BN.1, BF.11, and others.

  4. COVID-19 variants: What's the concern? - Mayo Clinic

    Together the omicron variants make up nearly all COVID-19infections in the United States. This is an estimate from early 2023 based on genetic sequencing of samples from people with COVID-19infections, according to the CDC. People who are up to date on their vaccines can get breakthrough infections.

  5. China faces new Covid wave from XBB variant that could peak ...

    Mark Schiefelbein / AP. BEIJING — China is bracing for a new wave of Covid-19 infections that could see as many as 65 million cases per week by the time the surge peaks at the end of June. It ...

  6. SARS-CoV-2 Variant Classifications and Definitions

    Key Points How Variants Are Classified Variants Being Monitored (VBM) Variant of Interest (VOI) Variant of Concern (VOC) Variant of High Consequence (VOHC) References Viruses like SARS-CoV-2 continuously evolve as changes in the genetic code (caused by genetic mutations or viral recombination) occur during replication of the genome.

  7. COVID-19 variants - World Health Organization (WHO)

    COVID-19: variants Viruses, like SARS-CoV-2, change over time and will continue to change the more they circulate. Sometimes, variants of the virus may develop. A variant is where the virus contains at least one new change to the original virus. Some variants of the coronavirus, such as Delta and Omicron, are spreading more easily between people.