Michigan hospital system will test workers’ blood in effort to help reopen country April 13, 2020 +2 000 workers could provide critical information about immunity.I FTTT Health Researchers at Beaumont Health believe their effort to test for coronavirus antibodies among 38 Washington Post 000 workers could provide critical information about immunity.I FTTT Health Researchers at Beaumont Health believe their effort to test for coronavirus antibodies among 38 Washington Post