US airports have been thrown into chaos as new coronavirus health screening measures for people returning from Europe come into force.
Long queues formed as travellers waited for hours for the screenings before passing through customs.
The US is banning the entry of people travelling from the UK and Ireland from midnight on Monday (04:00 GMT Tuesday).
As a result, the UK Foreign Office is now advising against all but essential travel to the whole of the US.
The US has more than 2,700 confirmed cases, with 54 deaths.
Correspondents say there is a growing sense of unease and confusion in the US, with fears of a run on hospital beds and concern about childcare as tens of millions of students are sent home from school.
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Australia announces that all travellers arriving in the country from midnight on Sunday local time (13:00 GMT on Saturday) would need to self-isolate for two weeks
UK Health Secretary Matt Hancock says moves are being planned in the coming weeks to isolate anyone over the age of 70.
At Chicago O’Hare and Dallas DFW airports, passengers reported long queues as travellers returning from Europe waited to be screened as part of measures to combat coronavirus.
The BBC reports that the US administration has imposed a ban on non-Americans travelling from the 26 European countries in the Schengen free movement zone, which will be extended to the UK and Ireland as of Tuesday.
US citizens are allowed to return but face screening.
