BBC People have started catching a new Covid variant that could soon take off and become the dominant type, according to scientists.
Identified in Germany, in June, cases of the XEC variant have since emerged in the UK, US, Denmark and several other countries, say users on X, formerly known as Twitter.
It has some new mutations that might help it spread this autumn, although vaccines should still help prevent severe cases, experts say.
For those more likely to become seriously ill from Covid, the NHS offers a free booster shot. The vaccines have been updated to better match recent variants, although not XEC, which has emerged from earlier Omicron subvariants.
Prof Francois Balloux, Director of the Genetics Institute at University College London, told BBC News that although XEC has a “slight transmission advantage” over other recent Covid variants, vaccines should still offer good protection.
He says it is possible XEC will become the dominant subvariant over the winter though.