Learn about what the lines mean and how to read results. 14 occasionally, some tests, particularly pcrs, may continue to show a positive test result for some time (up to 90 days), which can make it difficult to know if a new infection has occurred after a previous infection. You may choose a naat, including pcr, or antigen test If you use an antigen test and your result is negative, repeat testing following fda recommendations Researchers at rush and elsewhere are working hard to answer this question. If you test positive, follow these steps.
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