COVID-19 antibody testing is underway at multiple locations in California to determine just how widespread the coronavirus is there. Officials said this could help determine when the area can safely reopen. NBC News’ Gadi Schwartz explains how it will work.» Subscribe to MSNBC: http://on.msnbc.com/SubscribeTomsnbc

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COVID-19 Antibody Testing Study Begins In California | MSNBC