How Many Americans Have Been Tested for the Coronavirus?

With the new CDC site, the federal government is providing regular testing data again, and for the first time ever, it is doing so on a state-by-state level. But an initial analysis of the CDC’s state-level data finds major discrepancies between what many states are reporting and what the federal government is reporting about them. In Florida, for example, the disparity is enormous. The state government reported on Friday that about 700,000 coronavirus tests have been conducted statewide since the beginning of the outbreak. This count should be authoritative: Governor Ron DeSantis has ordered hospitals and doctors to report their test results to the Florida Department of Health. Yet the CDC reported more than 919,000 tests in the state in that same period. That’s 31 percent more tests than Florida itself seems to think it has conducted. (Because the CDC says it does not update its data on the weekends, we have, throughout this article, compared its figures against the numbers reported by each state on Friday.) When we asked the CDC to explain the discrepancy in Florida, the agency declined to comment on the record.

“If this is what they’re getting, the CDC should pick up the phone and call the state of Florida and say, ‘What’s happening?’” Ashish Jha, the K.T. Li Professor of Global Health at Harvard, told us.

Given the complexity and the multisource nature of the data, some variations should certainly be anticipated. But the inconsistencies we found suggest that Florida is not an outlier. Using the state numbers that match the CDC’s output most closely, in 22 states, the CDC’s reported number of tests diverges from the number reported by the state government by more than 10 percent. In 13 states, it diverges by more than 25 percent. In some cases, the CDC’s tallies are much higher than what states are reporting; in others, much lower.

In New Hampshire, the CDC reports about half as many tests as the state government; in Indiana, it reports about half as many more. California has reported the results of 1,133,906 tests, but the CDC is aware of 924,696. (Some of the largest discrepancies affect some of the country’s most populous states, including not only California but Illinois and Texas.) The state government of New Jersey says that 462,972 specimens have been analyzed. The CDC reports only 409,320. Alaska, Arizona, Colorado, Kentucky, Montana, North Carolina, Tennessee, Massachusetts, and Maryland also report testing figures that differ significantly from those published by the CDC. Curiously enough, the CDC’s state and national totals for cases and deaths match up well with what we’ve gathered from states at the COVID Tracking Project. So do its national testing totals. Only when you dig into the state-level testing data—where discrepancies skew in both directions—do things begin to go awry.

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