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

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   2021年12月16日 · A new variant of SARS-CoV-2 (the virus that causes COVID-19), B.1.1.529 (Omicron) ( 1 ), was first reported to the World Health Organization (WHO) by South Africa on November 24, 2021. Omicron has numerous mutations with potential to increase transmissibility, confer resistance to therapeutics, or partially escape infection- or vaccine-induced ...

   • Female: 25 (58)

   • Male: 17 (40)

2. 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 ...

3. www.cdc.gov › mmwr › volumesDurability of Original Monovalent mRNA Vaccine Effectiveness ...

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   2 天前 · During the period of SARS-CoV-2 Omicron predominance, receipt of ≥2 original monovalent COVID-19 vaccine doses was associated with fewer COVID-19–related hospitalizations in children and adolescents aged 5–18 years; however, protection from original ...

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

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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 and resistant to vaccine neutralization but causes less severe illness compared with previous variants (1–3).

5. www.cdc.gov › mmwr › volumesCOVID-19–Associated Hospitalizations Among Adults During ...

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   2022年3月24日 · This report describes adult COVID-19 hospitalization rates by race/ethnicity during SARS-CoV-2 Delta and Omicron predominance. ... Beginning the week of December 19–25, 2021, the B.1.1.529 (Omicron) variant of SARS-CoV-2 (the virus that causes COVID-19 ...

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

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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 › mmwr › volumesGenomic Surveillance for SARS-CoV-2 Variants: Circulation of ...

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   2023年6月15日 · This report summarizes U.S. trends in variant proportions from national genomic surveillance during January 2022–May 2023. During this period, the Omicron variant remained predominant, with various descendant lineages reaching national predominance (>50% prevalence).