(ANSA) - ROME, 04 JAN - The variant of Covid XBB 1.5, also called 'Gryphon', runs in the USA: CDC experts estimate that it has gone from 4% to 41% of infections in the last month.
Cnn reports it, underlining that in the north-east of the country it now represents 75% of cases.
"We haven't seen a variant take off at that rate for several months," said Pavitra Roychoudhury, director of Covid-19 sequencing at the University of Washington School of Medicine's laboratory of virology.
This variant - virologists and epidemiologists warn - could cause a new wave of Covid in the US.
(HANDLE).