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Researchers can test blood samples taken for other reasons to see if patients have previously had COVID-19. Don Bartletti/Los Angeles Times via Getty Images

COVID-19 official counts can miss mild cases – here’s how serosurveys that analyze blood for signs of past infection can help

Your blood can hold a record of past illnesses. That information can reveal how many people have had a certain infection – like 58% of Americans having had COVID-19 by the end of February 2022.
Rapid blood tests for coronavirus could fill a large gap in knowledge. Taechit Taechamanodom/Moment via Getty Images

Coronavirus tests are pretty accurate, but far from perfect

Expanding coronavirus testing is one of the most important tasks public health officials are tackling right now. But questions over accuracy of the two main types of tests have rightly caused concern.

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