COVID-19 Testing: What You Need to Know | CDC
https://www.cdc.gov/coronavirus/2019-ncov/testing/diagnostic-testing.html
WEBIf you are only going to take a single test, a PCR test will provide a more reliable negative test result. If you use an antigen test, a positive result is reliable, but a negative test is not always accurate. If your antigen test is negative, take another antigen test after 48 hours or take a PCR test as soon as you can.
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