Add Yahoo as a preferred source to see more of our stories on Google. A new COVID-19 strain, referred to as NB.1.8.1 or "Nimbus," first appeared in the U.S. sometime near the end of April and is ...

A new COVID variant is on the rise amid a nationwide summer surge of cases and it's on track to become the third most common strain. Variant XFG, colloquially known as "Stratus," was first detected in ...

A new Covid variant dubbed 'Stratus' has soared to dominance in the UK, with experts warning it could drive a wave of new infections. Stratus—technically called XFG—is thought to be more infectious ...

As the weather cools and fall approaches, COVID-19 cases are still spiking in much of the United States. The country has yet to emerge from a late summer COVID wave driven by the highly contagious new ...

COVID-19 variant XFG is spreading across the U.S., becoming the third most common strain. XFG is a combination of variants F.7 and LP.8.1.2 and may be less contagious than other dominant variants.