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There is a critical, global need for serology assays that can complement nucleic acid (PCR) tests for diagnosing COVID-19 infection.  Although critically important, PCR tests are only positive during the brief window of acute infection, after which they become negative. And while serology tests are not as effective as PCR early in acute infection, they are able to detect COVID-19 antibodies for a prolonged period of time after disease resolution, which enables identification of prior infection. Knowledge of prior infection is important and represents a significant unmet need in the management of the COVID-19 pandemic.