In the UK over the last few weeks, there have been a growing number of reports of people testing positive for COVID on a lateral flow test (LFT) but then negative on a polymerase chain reaction (PCR) ...

As the nation experiences what many experts believe is the second-largest wave of COVID infections since the pandemic started, many Americans will be checking to make sure they don’t have the ...

You wake up with a scratchy throat, runny nose, and persistent cough, but your at-home COVID-19 test reads negative. How is this possible? The short answer is yes—you can still be infected. Many other ...

A recent study published in Scientific Reports evaluated to what extent symptoms are present before, during, and after a positive SARS-CoV-2 polymerase chain reaction (PCR) test. The study also ...

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 test, it may not detect COVID after nine days, but it is more accurate for ...