There is now community transmission of the Omicron coronavirus variant in multiple regions of England.
Health Secretary Sajid Javid on Monday told MPs the variant was continuing to spread and there are now cases in the UK with no links to international travel.
Mr. Javid said there have been 336 confirmed cases of the highly-mutated variant across the UK, a rise of 90 from on Sunday.
There are concerns about how Omicron could interact with current vaccines.
Of the confirmed Omicron cases, 261 were in England, 71 in Scotland and four in Wales.
Mr. Javid said that as far as he was aware, none of those people had been admitted to hospital.