In late March, residents of the Colorado town of Telluride and surrounding San Miguel County stood in line, along marked spots spaced 6 feet apart, to have their blood drawn by medical technicians wearing Tyvek suits, face shields and gloves for a new COVID-19 test.While the Centers for Disease Control and Prevention’s tests for the virus that causes the respiratory illness have been in short supply since the outbreak began, this was a new type of test. It wasn’t to see who was sick right now. It was an antibody test that would assess who had been exposed and how widespread the virus was in th...


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