Coronavirus cases may surge in the coming weeks, as they have every summer since the pandemic began five years ago, experts said. Getting vaccinated, masking, improving air quality and staying away ...

A contagious new COVID-19 variant called NB.1.8.1, aka "Nimbus," is now dominant in the United States, CDC data show. What to ...

When the first reports of a new COVID-19 variant emerge, scientists worldwide scramble to answer a critical question: Will ...