Antibody study finds coronavirus infections may have been 10 times higher in Bay Area

Nearly ten times as many Bay Area residents had been infected with the coronavirus by the end of April than the official tally at the time, according to a new federal study that analyzed antibody tests to determine how widespread the virus was across a handful of United States hot spots. The study underscores just how deficient testing for the virus was in the early weeks of the pandemic, when the vast majority of cases were never identified. At the same time, it provides further evidence that aggressive shelter-in-place orders protected much of the Bay Area, where researchers estimate only about 1% of all residents had been infected by the time the study was done. That number is surely higher now with the outbreak surging again