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The Federal Centers for Disease Control and Prevention (CDC) recently issued Frequently Asked Questions regarding testing in nursing homes, including when an antigen test should be considered a false positive. The CDC’s Frequently Asked Questions be found in full here. This CDC resource should be read in conjunction with CMS’s testing memorandum, QSO 20-38, and resources from the Indiana State Department of Health, such as its recently released Antigen / PCR Testing Decision Tree.