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  1. 2021年11月28日 · Preliminary evidence suggests there may be an increased risk of reinfection with Omicron (ie, people who have previously had COVID-19 could become reinfected more easily with Omicron), as compared to other variants of concern, but information is limited.

    • Does Omicron Cause More Severe Covid-19 Illness?
    • Do The Covid Vaccines Still Work and Reduce The Risk of Severe Illness?
    • Does The Omicron Variant Show Up on Covid Tests?

    “For omicron, there are very limited data on this,” Bollinger says. “But, so far, the answer appears to be no. We will know more about this in the coming weeks.”

    According to Bollinger and Ray, this is the most important question, and with so little data, a lot is still unknown. “My own expectation is that being fully vaccinated, including boosters, will still provide a reduced risk of hospitalization and death,” Bollinger says. “In the weeks ahead, we will learn more about how well the antibodies induced b...

    The available commercial diagnostic PCR (polymerase chain reaction) and antigen COVID tests still appear to work to identify the omicron variant. We will know more in the coming weeks about how well the rapid at-home tests perform to detect the new variant.

  2. 2021年11月26日 · 世衛組織於2021年底警告說,Omicron變異株疫情可能會讓醫療系統不堪重負,尤其是在疫苗接種率低的國家,死亡率和發病率可能要高得多,世衛組織敦促所有國家加強COVID-19疫苗的接種。

  3. In November 2021, the transmissibility of the Omicron variant, as compared to the Delta variant or other variants of the COVID-19 virus, was still uncertain. Omicron is frequently able to infect previously COVID-19-positive people.

  4. 2023年8月17日 · Omicron is a variant of SARS-CoV-2, the virus that causes COVID-19. It first appeared in November 2021 and quickly became the dominant variant around the world. It spreads faster than previous ...

  5. 2022年11月25日 · What has changed, and why there hasn’t been a new variant of concern. 25 November 2022. It was 26 November 2021 that WHO declared that the world was facing a new variant of concern: Omicron. It would go on to change the trajectory of the COVID-19 pandemic.

  6. 2021年12月3日 · On Nov 25, 2021, about 23 months since the first reported case of COVID-19 and after a global estimated 260 million cases and 5·2 million deaths,1 a new SARS-CoV-2 variant of concern (VoC), omicron,2 was reported.

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