Here's what to know about the latest COVID strain - and how to tell if your at-home test is still good to use.

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 ...

There are three different ways to test for COVID-19: PCR tests, antigen tests and antibody tests. Each method is best for a different stage of COVID-19 infection. Used in sequence, all three methods ...

You can exhibit COVID-19 symptoms yet test negative due to early infection, low viral load, or immune response. PCR testing ...

This decision, well within current norms for care, was nonetheless consequential: The president was forced to cancel a trip to advocate for legislation in support of the domestic semiconductor ...

Amid a rise in COVID cases and the start of fall allergies, flu and RSV season, experts say testing is an important tool heading into the cooler month. With more people testing positive for COVID once ...

Note: This story is more than a week old. Given how quickly the Covid-19 pandemic is evolving, we recommend that you read our latest coverage here. Covid-19 community levels remain “low” in Vermont ...

The FDA imposed new restrictions on COVID-19 vaccines, limiting access to the updates shots to people who are at risk for ...

BEIJING — China said Tuesday that it would no longer require travelers entering the country to show a negative PCR test for the coronavirus, another step toward reopening after a long period of ...