"As these viruses continue to evolve, public health officials watch carefully to see whether new strains will be more easily ...

A new COVID-19 variant is climbing the ranks in the United States, becoming the third-most common strain of the summer. Variant XFG, colloquially known as "Stratus," was first detected in Southeast ...

A new COVID-19 variant called "Stratus" has been circulating in Oklahoma, and the state's positive test rate has been higher than the national average during the summer months. Stratus is the ...

COVID-19 cases were relatively low across the country for most of the summer, but they’re now creeping up again. Data shows that this is thanks to the new COVID-19 variant XFG, nicknamed Stratus, ...

As summer comes to an end, COVID-19 cases are on the rise again in California. While respiratory viruses usually peak in the winter, the novel coronavirus can also surge in the warmer months.

A new COVID-19 variant sweeping through China has yet to make a sizable footprint in the U.S., the Centers for Disease Control and Prevention (CDC) says. In January, a new COVID-19 variant known as NB ...

The first known meta-analysis of how SARS-CoV-2 variant type and time since infection influence long-COVID symptoms ties Omicron to brain fog and paresthesia (numbness and tingling), while earlier ...

AI-generated summary reviewed by our newsroom. Read our AI Policy. XFG variant rose from 14% to 78% of U.S. cases between June and August 2025. Updated vaccines offer protection; older or at-risk ...

XFG variant rose from 14% to 78% of U.S. cases between June and August 2025. Updated vaccines offer protection; older or at-risk adults advised to act early. CDC urges masks, hand hygiene and rapid ...