Article,

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

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MMWR. Morbidity and Mortality Weekly Report, 71 (6): 206--211 (February 2022)
DOI: 10.15585/mmwr.mm7106a4

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