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In COVID-19 testing, what is testing efficiency?

Testing efficiency is the proportion of SARS-CoV-2-positive cases identified out of all individuals tested. For example, if under a certain testing strategy, 100 people were tested and 6 were identified as cases, the expected efficiency of that strategy would be 6/100 = 0.06 cases per test. Efficiency is a function of the strategy-conditional probability of identifying a case, with each strategy defined by one or more covariates.