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. 2023 Jun 16;72(24):651–656. doi: 10.15585/mmwr.mm7224a2

FIGURE 1.

Figure 1 comprises two panels, the first of which is an area chart illustrating national weekly proportion estimates of SARS-CoV-2 variants. The second is a bar chart illustrating estimated numbers of cases attributed to each variant in the United States during January 2, 2022–May 13, 2023.

National estimates of weekly proportions* of SARS-CoV-2 variants† (A) and estimated number of variant-attributed cases§ (B) — United States, January 2, 2022–May 13, 2023

Abbreviations: CELR = COVID-19 electronic laboratory reporting; NS3 = National SARS-CoV-2 Strain Surveillance Program.

* 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. https://covid.cdc.gov/covid-data-tracker/#variant-proportions

† Lineages reaching a prevalence of ≥1% with spike protein substitutions of potential therapeutic relevance and separated out on the COVID Data Tracker website.

§ Estimated numbers of COVID-19 cases attributable to variants were calculated by multiplying weekly numbers of reported positive nucleic acid amplification tests from CELR with estimated variant proportions.