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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.
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.
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 ...
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.
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.
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COVID-19 pandemicPublic Health Emergency
The COVID-19 pandemic, also known as the coronavirus pandemic, is an ongoing pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). It was first identified in December 2019 in Wuhan, China. wikipedia.org
- Coronavirus disease 2019 (COVID-19)
- Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)
- December 2019 - present
- Wuhan, Hubei, China
- Symptoms may appear 2-14 days after exposure to the virus. People with these symptoms may have COVID-19: Cough, shortness of breath or difficulty breathing, fever, chills, muscle pain, sore throat, new loss of taste or smell.
- The median incubation period for COVID-19 is four to five days. Most symptomatic people experience symptoms within two to seven days after exposure.
- Human-to-human transmission via respiratory droplets
- Avoiding close contact with sick individuals; frequently washing hands with soap and water; not touching the eyes, nose, or mouth with unwashed hands; and practicing good respiratory hygiene
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