The Wall Street Journal: Old U.S. COVID-19 hot spots are the new hot spots

The recent rise in Covid-19 cases in the U.S. has largely been driven by a handful of states, many of them the same places that first emerged as hot spots a year ago. Through Monday, about 75% of the previous week’s new cases in the U.S. came from Michigan, Florida, New York, Pennsylvania and New Jersey.

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