A new COVID-19 strain has been reported in dozens of countries, including the U.S. Here's what you should know about it.

A new COVID-19 variant, nicknamed Nimbus, is rising around the world — including in California — and known for giving “razor ...

Health experts explain the difference in symptoms as pollen levels increase and the new Covid NB.1.8.1 variant surges in UK ...

COVID appears to be on the rise as a new, highly contagious subvariant — featuring “razor blade throat” symptoms overseas — ...

Vaccine makers will have to run large new trials before updated shots can be approved for everyone who is not at a higher-than-average risk.