Alliance for Pandemic Preparedness

June 10, 2021

Genomic Surveillance for SARS-CoV-2 Variants Circulating in the United States, December 2020–May 2021

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  • During April 11-24, 2021, the SARS-CoV-2 B.1.1.7 (Alpha) variant accounted for an estimated 66% of US infections and the P.1 (Gamma) variant accounted for 5% of US infections, according to the CDC. Estimates are based on sequencing of 25,000 SARS-CoV-2-positive specimens, representing 3% of all reported positive tests and weighted to the general population. Estimated proportions of B.1.1.7 (Alpha) infections varied by Department of Health and Human Services (HHS) geographic regions. B.1.1.7 (Alpha) infections represented 52% of infections in HHS region 10, which includes Washington State.

Paul et al. (June 11, 2021). Genomic Surveillance for SARS-CoV-2 Variants Circulating in the United States, December 2020–May 2021. MMWR. https://doi.org/10.15585/mmwr.mm7023a3