But these Omicron sub-variants have all been widely detected outside China - including in the UK.
Omicron has been the dominant global variant for more than a year, but that does not exclude the possibility that a new variant of concern will emerge in future.
A key reason that many countries are imposing Covid checks on travellers from China is the lack of surveillance data coming out of the country. The more Covid that is circulating, the more chance there is for the virus to mutate.
