US COVID-19 Cases Caused by Variants

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CDC is closely monitoring these variants of concern (VOC). These variants have mutations in the virus genome that alter the characteristics and cause the virus to act differently in ways that are significant to public health (e.g., causes more severe disease, spreads more easily between humans, requires different treatments, changes the effectiveness of current vaccines).

The map above displays reported data on three VOCs, B.1.1.7, B.1.351, and P.1. Variants B.1.427 and B.1.429 have recently been classified as VOCs but are currently not featured on this map. Additional data is available on Variant Proportions in the US.

03/14/21 – To maintain a limited number of colors and allow for an easier comparison between states, the data ranges have changed from 1-100 to 1-150. There are currently no states with 451-600 cases of these variants of concern, so this category is not represented in the key.

*The cases identified above are based on a sampling of SARS-CoV-2-positive specimens and do not represent the total number of B.1.1.7, B.1.351, and P.1 lineage cases that may be circulating in the United States and may not match numbers reported by states, territories, tribes, and local officials.

†Numbers will be updated on Sunday, Tuesday, and Thursday by 7:00 pm.