Contact tracing is a key strategy for controlling the spread of COVID-19, but a new study finds that delays in COVID-19 testing will significantly hamper this process.

The study researchers found that even the best contact-tracing strategy — where all contacts of an infected person are identified and alerted — won’t reduce the spread of the virus if there is a delay of three or more days between when a person shows symptoms and when they are tested for COVID-19 (and get test results).

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