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  1. 2023年8月17日 · What Is the Omicron Variant? In November 2021, the World Health Organization (WHO) first identified the Omicron mutation of the COVID-19 virus as a variant of concern. It quickly became the...

  2. 2023年12月19日 · COVID-19 Transmission. By understanding how coronavirus spreads, you can take the right steps so you don't get sick and infect others. COVID transmission rate. Recent data from the World Health...

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  4. 2022年12月26日 · The Omicron variant, which is now the dominant strain of COVID-19 in the United States, is highly contagious and spreads faster than the original virus.

  5. 2023年11月15日 · Omicron subvariant BA.2.12.1: In the spring of 2022, it made up almost 43% of COVID-19 infections in the U.S. Omicron variants BA.4 and BA.5. These were first spotted in South Africa.

  6. 2024年7月22日 · While Omicron spreads easily, Schaffner said he has noticed brief illnesses, maybe 3 to 4 days of symptoms, for most who get infected now.

  7. 2023年11月10日 · Newer versions of COVID-19, like the Omicron strain EG.5, tend to infect the upper respiratory tract. Common symptoms of the new COVID-19 variants include a runny nose, sore throat , and other ...

  8. 2022年12月29日 · Some research even suggests the Omicron variant may not be as severe in the lungs as other variants. But if your symptoms include trouble breathing, get help right away. NEWSLETTER