The Foreign Office has warned against all but essential travel to the United States.
The move comes hours after Washington said a ban on UK and Irish flights to the US would be introduced because of the coronavirus outbreak.
A Foreign Office spokesperson said: ”We are advising against all but essential travel to the USA following the US government announcement imposing restrictions on travel from the UK.”
Britons will be added to America’s ban on travellers from Europe from 4am GMT on Tuesday.
People with journeys planned are advised to check with their airline and tour operator.
Those already in America are also recommended to stay in contact with their travel company and airline.
Acting homeland security secretary Chad Wolf said the ban had been extended because of the growing COVID-19 outbreak in the UK, where 35 people have died.
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