Above left:
The chart above shows the biweekly estimated proportions of the most common SARS-CoV-2 lineages circulating in the United States, based on > 25,000 sequences collected through CDC national genomic surveillance since Dec 20, 2020 and grouped in two-week intervals. Proportion estimates are subject to change over time and will be updated as more data becomes available.
The most recent data, shown in the rightmost column and highlighted in gray, are subject to change as specimens from that period are still being processed.
B.1.526, P.2, and B.1.525 are currently characterized as Variants of Interest (VOI). B.1.429, B.1.427, B.1.1.7, B.1.351, and P.1 are currently characterized as Variants of Concern (VOC). The most common circulating variants, B.1.2, B.1., B.1.1.222, B.1.243, B.1.234, B.1.311, are neither VOIs nor VOCs. Other variants are labeled as “Other” and represent >200 additional lineages which are each circulating at <2% of viruses during the period analyzed.
Above, right:
The table above lists the current VOIs and VOCs and the most common co-circulating SARS-CoV-2 lineages in the United States based on proportion. Percentages are based on CDC surveillance samples collected during the four-week period ending February 13, 2021.
Additional work is underway to produce model-based estimates of the prevalence of SARS-CoV-2 variants. These estimates are expected to be reported on this page in the near future.