Doctors and scientists are paying close attention to COVID-19 subvariant 'XEC' and expect it might surpass the latest hyperinfectious subvariant KP.3.1.1 in the US, reports said. "XEC is just getting started now around the world and here," LA Times quoted Doctor Eric Topol as saying. "XEC is taking charge...But it's months off from getting into high levels," Topol added.