It is important for healthcare providers and testing professionals to understand the performance characteristics of the antigen test used, including sensitivity, specificity, and positive and negative predictive value, and to follow the manufacturer's instructions for use, which summarize performanc

General guidanceAntigen testing is commonly used to diagnose other respiratory pathogens, including influenza virus and respiratory syncytial virus (RSV). The U.S. Food and Drug Administration (FDA) has granted Emergency Use Authorization (EUA) for an antigen test that recognizes SARS-CoV-2. See FDA