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Description
To identify and track SARS-CoV-2 variants, CDC uses genomic surveillance. CDC's national genomic surveillance system collects SARS-CoV-2 specimens for sequencing through the National SARS-CoV-2 Strain Surveillance (NS3) program, as well as SARS-CoV-2 sequences generated by commercial or academic laboratories contracted by CDC and state or local public health laboratories. Viral genomic sequences are analyzed and classified as a particular variant. The proportions of variants in a population are estimated nationally, by HHS region, and by jurisdiction. The thousands of sequences analyzed every week through CDC’s national genomic sequencing and bioinformatics efforts fuel this comprehensive and population-based U.S. surveillance system established to identify and monitor the spread of variants.
These data appear on the CDC COVID Data Tracker at the following URL: https://covid.cdc.gov/covid-data-tracker/#variant-proportions
For more information on how these data are generated and used to provide estimates of variant proportions, please see the following references:
- Paul P, France AM, Aoki Y, et al. Genomic Surveillance for SARS-CoV-2 Variants Circulating in the United States, December 2020–May 2021. MMWR Morb Mortal Wkly Rep 2021;70:846–850. DOI: http://dx.doi.org/10.15585/mmwr.mm7023a3
- Lambrou AS, Shirk P, Steele MK, et al. Genomic Surveillance for SARS-CoV-2 Variants: Predominance of the Delta (B.1.617.2) and Omicron (B.1.1.529) Variants — United States, June 2021–January 2022. MMWR Morb Mortal Wkly Rep 2022;71:206–211. DOI: http://dx.doi.org/10.15585/mmwr.mm7106a4
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Meta
- Category
- Laboratory Surveillance
- Permissions
- Public
- Tags
- sars-cov-2, covid-19, surveillance, variant surveillance, variant proportion, nowcasting
- Row Label
- Weekly estimate of SARS-CoV-2 variant as a proportion of surveillance sequencing
- SODA2 Only
- Yes
Licensing and Attribution
- Data Provided By
- SSEV Bioinformatics
- Source Link
- https://www.cdc.gov
- License
- Public Domain U.S. Government
Common Core
- Contact Name
- Clinton Paden
- Contact Email
- eocevent506@cdc.gov
- Public Access Level
- public
- Bureau Code
- 009:20
- Program Code
- 009:038
- Geographic Coverage
- United States
- Update Frequency
- Weekly
Data Quality
- Suggested Citation
- Lambrou AS, Shirk P, Steele MK, et al. Genomic Surveillance for SARS-CoV-2 Variants: Predominance of the Delta (B.1.617.2) and Omicron (B.1.1.529) Variants — United States, June 2021–January 2022. MMWR Morb Mortal Wkly Rep 2022;71:206–211. DOI: http://dx.doi.org/10.15585/mmwr.mm7106a4
- Geographic Unit of Analysis
- National (USA); HHS Region
- Analytical Methods Reference
- https://github.com/CDCgov/SARS-CoV-2_Genomic_Surveillance
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