
Novel strains of the coronavirus are creating new health concerns around the world as fresh descendants of the highly-transmissible Omicron variant now make up 40 per cent of cases in the US.
The two strains, XBB and XBB.1.5 have seen a surge in cases in countries worldwide. The World Health Organisation has warned the new and “recombinant” Covid variant XBB.1.5 is the “most transmissible yet.”