180: Characteristics of Persons With Positive COVID-19 PCR Tests Later Testing Negative for Antibodies. (January 2021) - Pepe, Paul; Antevy, Peter; Scheppke, Kenneth; Marino, Megan; Nichols, Emily; Nguyen, Linh; Spencer, Emma; Redfield, Colby; Katz, Randy; Babinec, Frank; Rivkees, Scott