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https://ehssafetynewsamerica.com/2020/06/16/6-15-48-these-3-numbers-offer-a-simple-way-to-understand-contact-tracing-in-the-workplace-covid-19-contacttracing/
6-15-48: These 3 Numbers Offer A Simple Way To Understand Contact Tracing In The Workplace - #COVID-19 #ContactTracing