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

  • Written by Isobel Routledge, Postdoctoral Scholar in Medicine, University of California, San Francisco
COVID-19 official counts can miss mild cases – here's how serosurveys that analyze blood for signs of past infection can helpResearchers 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

It’s an eye-catching statistic: 58% of the whole population and 75% of kids in the U.S. had been infected by the coronavirus by the end of February 2022. That’s a pretty big jump...

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