US Covid-19 Cases Caused by Variants

See also:

Map: Track the spread of the Covid-19 variants across the United States https://www.nbcnews.com/health/health-news/map-track-spread-...

About Variants of the Virus that Causes COVID-19 https://www.cdc.gov/coronavirus/2019-ncov/transmission/varia...

Variants of SARS-CoV-2 https://en.wikipedia.org/wiki/Variants_of_SARS-CoV-2