Add Yahoo as a preferred source to see more of our stories on Google. As the federal health emergency ended May 11 and COVID numbers are on the rise, here's how you can still access tests, at-home and ...

Understanding how long you test positive for COVID-19 can help you determine how long to stay quarantined.What you can do: Use a rapid antigen test to check for current infection after recovery.The ...

These tests have very limited clinical use. The need for antibody testing would be to determine if a patient has recovered from COVID-19, and whether we could take a sample of the patient’s plasma to ...

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Researchers often call the polymerase chain reaction test – known as the PCR test – "the gold standard" for detecting the COVID-19 virus. The test is considered highly reliable and effective, and it ...