BBC If you feel unwell with a bad throat and a temperature you may well have caught one of the new strains of Covid circulating this autumn.
XFG, called Stratus by some, and NB.1.8.1, known as Nimbus, are now the most common variants being passed around in the UK, according to officials.
Experts say these do not appear to pose any bigger threat than previous types of Covid or make people feel more ill.