Every American traveling abroad needs to take an antigen test to return to the United States. But the start of the trip is often even more cumbersome, as many other countries (nearly every one I have ...

With Omicron surging in the United States, many people are taking COVID-19 tests to see whether they test positive. Most people will take either a rapid antigen or PCR test. Though the PCR test is ...

Polymerase chain reaction (PCR) is a fundamental molecular biology tool that scientists use to amplify and analyze genetic material, such as DNA and RNA. PCR involves the enzymatic amplification of ...

(CNN) -- One is widespread but has key shortages across its supply chain. One remains questionably reliable and is only helpful after the fact. And one is still early in development -- but could speed ...

People often talk about COVID-19 testing like it means only one thing. But in reality, the U.S. Food and Drug Administration (FDA) has so far granted emergency-use authorization to more than 200 ...

At first blush, you might reasonably dismiss the rapid, saliva-based antigen assay for coronavirus. What possible purpose can a test serve in a pandemic if it misses, say, 30 of every 100 infections ...