Genomic surveillance for SARS-CoV-2 variants circulating in the United States, December 2020–May 2021

摘要: CDC’s genomic surveillance for SARS-CoV-2 variants generates population-based estimates of the proportions of variants among all SARS-CoV-2 infections in the United States. During April 11–24, 2021, the B. 1.1. 7 and P. 1 variants represented an estimated 66.0% and 5.0% of US infections, respectively, demonstrating the potential for new variants to emerge and become predominant.