Variants and Genomic Surveillance for SARS-CoV-2
Variants and Genomic Surveillance for SARS-CoV-2
Variants and Hospitalizations
CDC is monitoring current COVID-19 cases. Learn more about variants and their expected impact on hospitalizations.
Genomic Surveillance
About Variants
Many viruses are constantly changing, including the virus that causes COVID-19. These changes occur over time and can lead to the emergence of variants that may have new characteristics, including different ways of spreading.
Research and Selected Publications
- MMWR: Spike Gene Target Amplification in a Diagnostic Assay as a Marker for Public Health Monitoring of Emerging SARS-CoV-2 Variants — United States, November 2021–January 2023
- MMWR: 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: Genomic Surveillance for SARS-CoV-2 Variants Circulating in the United States, December 2020–May 2021