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Why do the number of cases of the coronavirus disease for previous days increase?

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Delays in reporting can cause the number of COVID-19 cases reported on previous days to increase. (Sometimes this effect is described as "backfill.") State, local, and territorial health departments report the number of cases that have been confirmed and share these data with CDC. Since it takes time to conduct laboratory testing, cases from a previous day may be added to the daily counts a few days late.
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