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Comparison of coronavirus disease (COVID-19) case numbers over time and between locations is complicated by limits to virologic testing to confirm severe acute respiratory syndrome coronavirus 2 infection. The proportion of tested individuals who have tested positive (test-positive proportion, TPP) can potentially be used to inform trends in incidence. We propose a model for testing in a population experiencing an epidemic of COVID-19, and derive an expression for TPP in terms of well-defined parameters related to testing and presence of