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. 2022 Feb 11;71(6):206–211. doi: 10.15585/mmwr.mm7106a4

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The figure is an area graph illustrating national weekly proportion estimates of SARS-CoV-2 variants in the United States from January 2, 2021, through January 22, 2022. — National weekly proportion estimates* of SARS-CoV-2 variants^† — United States, January 2, 2021–January 22, 2022

Abbreviations: NS3 = National SARS-CoV-2 Strain Surveillance program; PANGO = Phylogenetic Assignment of Named Global Outbreak; WHO = World Health Organization.

* Sequences are reported to CDC through NS3, contract laboratories, public health laboratories, and other U.S. institutions. Variant proportion estimation methods use a complex survey design and statistical weights to account for the probability that a specimen is sequenced.

^† SARS-CoV-2 WHO variant label and PANGO lineage: Alpha (B.1.1.7); Beta (B.1.351); Gamma (P.1); Delta (B.1.617.2), Epsilon (B.1.427/B.1.429); Zeta (P.2); Eta (B.1.525); Iota (B.1.526); Kappa (B.1.617.1); Lambda (C.37); Mu (B.1.621); and Omicron (B.1.1.529). https://www.cdc.gov/coronavirus/2019-ncov/variants/variant-classifications.html