Researchers surprised: 20% of Chicagoans in blood-test study came up positive for coronavirus antibodies – Chicago Tribune

The SCAN study, launched in late June, set out to check about 3,000 people in 10 Chicago ZIP codes, and so much more than 1,000 tests have actually been analyzed, McNally said. Scientists are finding some distinctions in exposure rates among the ZIP codes but said they require to gather more test results before reaching any conclusions.