NEW YORK -- Millions of Americans have purchased rapid COVID-19 tests online or at local stores and signed up to receive test kits through a free government program. Unlike conventional, lab-processed ...

At the start of the SARS-CoV-2 pandemic people who felt unwell had to join long queues for lab-based PCR tests and then wait for two days to learn if they were infected with the COVID-19 virus or not.

Add Yahoo as a preferred source to see more of our stories on Google. As we get into another winter holiday season, COVID is still part of our lives. And although it's hard to predict exactly what ...

You may get a PCR test, which can show a positive result for up to three months after recovery. If you take a rapid antigen ...