Lambrou AS, Shirk P, Steele MK, Paul P, 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.
PMID: 35143464