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 ...

The XFG COVID-19 variant, aka "Stratus," is spreading rapidly in the U.S. as cases rise. Here's what to know about symptoms ...

COVID-19 cases are rising across the United States, driven by new variants Stratus (XFG) and Nimbus (NB.1.8.1). While Stratus ...

Uruguay's Ministry of Public Health (MSP) has confirmed the circulation in the country of the new Covid-19 “Frankenstein” ...

The XFG variant was first detected in January in southeast Asia. The earliest U.S. case was in March. So far in MD, case ...

Nimbus has quickly established itself as the leading strain of SARS-CoV-2 in the US, accounting for an estimated 43 percent of Covid-19 infections as of June 2025, according to the Centres for ...

In May, Nimbus began to assert its rise to dominance. By the week ending May 10, NB.1.8.1 had risen to 5% of cases in the United States. That share jumped to 10% by May 24. By the week ending June ...

Nimbus is one of the latest variants of COVID-19 that health authorities are keeping an eye on. Its lineage designation is NB.1.8.1 and is a subvariant of Omicron.

Its official title is NB.1.8.1, but some have taken to calling it “Nimbus”. In the Southern Hemisphere, where flu season is just starting to ramp up, medics are bracing for a new wave of cases ...