Michigan coronavirus data for Thursday, July 21: 5 counties surpass 5% test positivity

COVID-19 file image

An MLive file image of COVID-19 testing supplies and materials at a testing location

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Public health officials use test positivity rates to determine both the current level of SARS-CoV-2 transmission in a given community, and if enough testing is being done to accurately depict spread of the virus.

Early in the coronavirus pandemic, the World Health Organization recommended community closures if test rates surpassed 5%, indicating that viral spread was too high and/or not enough testing was being done to accurately gauge transmission.

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