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1. www.cdc.gov › mmwr › volumesSARS-CoV-2 B.1.1.529 (Omicron) Variant — United ...

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   2021年12月16日 · SARS-CoV-2 variant B.1.1.529 (Omicron), first reported to WHO on November 24, 2021, has been designated a variant of concern. Mutations in Omicron might increase transmissibility, confer resistance to therapeutics, or partially escape infection- or vaccine-induced immunity.

2. www.cdc.gov › coronavirus › 2019-ncovVariants of the Virus | CDC

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   2023年2月6日 · New variants of SARS-CoV-2, the virus that causes COVID-19, will continue to occur. CDC coordinates collaborative partnerships which continue to fuel the largest viral genomic sequencing effort to date. The Omicron variant, which emerged in November 2021, has many lineages.

3. www.cdc.gov › mmwr › volumesSARS-CoV-2 B.1.1.529 (Omicron) Variant Transmission Within ...

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   2022年3月3日 · To investigate the effectiveness of prevention strategies in household settings, CDC partnered with four U.S. jurisdictions to describe Omicron household transmission during November 2021–February 2022. Persons with sequence-confirmed Omicron infection and

4. 其他人也問了

   How does Omicron variant affect health care systems?

   • Although disease severity appears lower with the Omicron variant, the high volume of hospitalizations can strain local health care systems and the average daily number of deaths remains substantial.

   Trends in Disease Severity and Health Care Utilization

   www.cdc.gov/mmwr/volumes/71/wr/mm7104e4.htm

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   Is Omicron a virulent strain?

   • By late December, it became the predominant strain, and by January 15, 2022, it represented 99.5% of sequenced specimens in the United States* ( 1 ). The Omicron variant has been shown to be more transmissible and less virulent than previously circulating variants ( 2, 3 ).

   Trends in Disease Severity and Health Care Utilization

   www.cdc.gov/mmwr/volumes/71/wr/mm7104e4.htm

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   How severe is Omicron variant infection?

   • Many of the first reported cases of Omicron variant infection appear to be mild ( 7 ), although as with all variants, a lag exists between infection and more severe outcomes, and symptoms would be expected to be milder in vaccinated persons and those with previous SARS-CoV-2 infection than in unvaccinated persons.

   SARS-CoV-2 B.1.1.529 (Omicron) Variant — United States

   www.cdc.gov/mmwr/volumes/70/wr/mm7050e1.htm

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   Why is the Omicron period important?

   • Although patients hospitalized during the Omicron period have shorter stays and less frequent ICU admissions, the high volume of hospitalizations resulting from high transmission rates during a short period can strain local health care systems in the United States, and the average daily number of deaths remains substantial.

   Trends in Disease Severity and Health Care Utilization

   www.cdc.gov/mmwr/volumes/71/wr/mm7104e4.htm

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5. www.cdc.gov › mmwr › volumesClinical Characteristics and Outcomes Among Adults ...

   www.cdc.gov › mmwr › volumes

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   2022年2月10日 · In mid-December 2021, the B.1.1.529 (Omicron) variant of SARS-CoV-2, the virus that causes COVID-19, surpassed the B.1.617.2 (Delta) variant as the predominant strain in California. Initial reports suggest that the Omicron variant is more transmissible and1

6. www.cdc.gov › mmwr › volumesTrends in Disease Severity and Health Care Utilization ...

   www.cdc.gov › mmwr › volumes

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   2022年1月27日 · COVID-19 disease severity appears to be lower during the Omicron period than during previous periods of high transmission, likely related to higher vaccination coverage, † which reduces disease severity (4), lower virulence of the Omicron variant (3,5,63,7).

7. www.cdc.gov › coronavirus › 2019-ncovSARS-CoV-2 Variant Classifications and Definitions

   www.cdc.gov › coronavirus › 2019-ncov

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   These classification updates allow for independent evaluation and tracking of Omicron sublineages and forthcoming new variants when required. The SIG uses four types of classifications : Variant of high consequence (VOHC)

8. www.cdc.gov › mmwr › volumesEffectiveness of 2, 3, and 4 COVID-19 mRNA Vaccine Doses ...

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   2022年7月21日 · Omicron sublineages BA.2 and BA.2.12.1 emerged later and by late April 2022, accounted for most cases.* Estimates of COVID-19 vaccine effectiveness (VE) can be reduced by newly emerging variants or sublineages that evade vaccine-induced immunity ( 1 ), protection from previous SARS-CoV-2 infection in unvaccinated persons ( 2 ), or ...