Because the Johns Hopkins fall 2020 approach to testing was based on a more limited testing program-twice-weekly asymptomatic testing of a small number of students living on campus and participants in an epidemiological surveillance study as well as medical management testing of symptomatic individuals-the positivity rate would not have the same relevance as it would for state or local health departments. It is not a measure of how prevalent a disease is in a community. Importantly, positivity is a measure of testing capacity, and can be used to inform our interpretation of case trends. Positivity: Test positivity rates are a metric used to help public health officials determine whether their state or county is testing enough of its population for the size of its epidemic.
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