1. Enforcement policy for viral transport media during the coronavirus disease 2019 (COVID19) public health emergency (revised): guidance for commercial manufacturers, clinical laboratories, and Food and Drug Administration staff Publication: [Silver Spring, MD] : Center for Devices and Radiological Health, November 2021 Subject(s): Culture MediaSpecimen HandlingTransportationVirus DiseasesCOVID-19United StatesUnited States. Department of Health and Human ServicesUnited States. Food and Drug Administration