It looks like millions of cases were missing from the number of U.S. COVID-19 infections reported through September 2020, according to data just published in JAMA Network Open. The problem seems to have been a lack of understanding of how prevalent the virus could be in asymptomatic patients. Blood samples from 61,910 adults who were “well” at the time they applied for life insurance showed a 6.6% positivity rate. Extrapolating that rate to the entire …
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