Watch Covid-19 cases envelop the United States

Beginning on July 1, 2021, amid a relatively calm summer, the emergence of new delta-variable-fueled cases spread across the south in August. The chests then climb across the Plains, the Midwest, and the Northeast by fall.

Another dramatic rise dominates the map starting in December, likely attributed to the more transmissible Omicron variant. As of this week, nearly every county is reporting average rates above 100 new cases per 100,000 people. The national average daily new cases is now more than three times the peak of the epidemic last winter.

The animation is based on county-level data collected by local governments and tracked by the Johns Hopkins University Center for Systems Science and Engineering.
An estimated 64 million cases have been reported in the United States since the outbreak of the pandemic in 2020, a number that represents about 19 percent of the population — although some people have contracted Covid-19 more than once.

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Data from Johns Hopkins University’s Center for Systems Science and Engineering every day from July 1, 2021 through January 13, 2022. New cases that are missing or not assigned to a particular county are excluded. Because of the reporting of anomalies, the number of new county cases in Nebraska has been omitted from September 25 to October 1, 2021.

revision: An earlier version of the footnote misspelled the year in which the animation ends.

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