New study finds 1 in 3 Americans were infected with coronavirus by the end of 2020

While official numbers report nearly 20 million confirmed cases of COVID-19 last year, according to The COVID Tracking Project, researchers estimate that nearly one-third of the U.S. population, 31 percent or 103 million Americans, had COVID-19 at some point last year.

In the upper Midwest and Mississippi valley, including the Dakotas, Minnesota, Wisconsin and Iowa, nearly two-thirds, 60 percent, of the population was estimated to have had COVID-19 in 2020. Meanwhile, nearly half the residents of Chicago, Los Angeles, Miami and New York City (48 percent, 52 percent, 42 percent and 44 percent, respectively) were likely infected in 2020, according to the study published in the journal Nature.


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