Public health officials have engaged in large scale testing to prevent SARS-CoV-2 transmission. The logic is that identified spreaders can quarantine to reduce the infection rate.

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FDA Policy for Coronavirus Disease-2019 Tests During the Public Health Emergency (Revised November 2021) https://www.fda.gov/regulatory-information/search-fda-guidance-documents/policy-coronavirus-disease-2019-tests-during-public-health-emergency-revised

FDA Notifications and Emergency Use Authorizations-- FAQs on Testing for SARS-CoV-2 https://www.fda.gov/medical-devices/coronavirus-covid-19-and-medical-devices/notifications-and-emergency-use-authorizations-faqs-testing-sars-cov-2

Problems using PCR to detect SARS-CoV-2