At least 12 states in the U.S have reported a case of COVID with a new variant called XEC, which is on the rise in some European countries and other parts of the world. But despite the importance of surveillance of emerging variants,

At the end of June this year, a new variant of COVID-19, designated as XEC, was first detected in Germany and India. It is expected to spread to other contininents. On Wednesday, the British "Independent" reported that over 500 samples tested for the presence of XEC had been detected.

The new "XEC" COVID-19 variant spreading rapidly in Europe has arrived in the US. What are the symptoms, will it cause a fall surge, and are vaccines effective? Experts discuss