National COVID trackers show Colorado as a hotspot, but many of those ‘new’ cases are from January

The Denver Post: Colorado looks like a COVID-19 hotspot on some national pandemic trackers, but those numbers can be misleading because many of the cases being recorded as new are actually months old.

On Monday morning, The New York Times’ tracker showed Colorado averaged an eye-catching 1,323 new COVID-19 cases per day over the previous week. But the Colorado Department of Public Health and Environment showed a more-modest average of 446 cases per day.

The problem is that the Centers for Disease Control and Prevention and national trackers, like the one published by the Times, have been getting their case numbers by subtracting the cumulative number of cases on any given day from the cumulative number a day earlier.

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