A new Covid subvariant spreading rapidly across the United States is the “most transmissible yet”, said a World Health Organisation scientist.
And with the threat from the highly infectious XBB.1.5 concerns have been reportedly raised about how well the UK is prepared for a fresh Covid wave.
In the US, the number of XBB.1.5 cases rose from 4% to 41% of Covid infections during December but at the same time it does not appear to be any more lethal than Omicron.