1. Policy for coronavirus disease-2019 tests during the public health emergency (revised): immediately in effect guidance for clinical laboratories, commercial manufacturers, and Food and Drug Administration staff Publication: [Silver Spring, MD] : Center for Devices and Radiological Health, May 11, 2020 Subject(s): Clinical Laboratory TechniquesCOVID-19 Serological TestingCOVID-19 TestingUnited StatesUnited States. Department of Health and Human Services.United States. Food and Drug Administration.