The NHS has told people who return from anywhere in Italy to self-isolate themselves if they have symptoms of coronavirus.
Italy is the most affected nation in Europe, where the number of deaths in the epidemic has increased from 107 to 148 in a single day.
People returning to the UK from Italy had previously been told to isolate themselves only if they were in the north of the country and had symptoms.
The Italian government ordered the closure of all schools and universities until at least March 15, banned all public meetings and said it would close cinemas and theaters.
There have been at least 3,858 infections in the country.
The government has also placed temporary restrictions on visiting relatives in nursing homes and is urging the elderly not to go out except in cases of absolute necessity.
Three more people died of coronavirus, bringing the total to seven, while the number of confirmed infections increased from 138 to 423, including 23 people in serious condition.
President Emmanuel Macron said it seems “inevitable” that the epidemic will turn into an epidemic in France.
The death toll across the country is 11, including 10 in the Seattle area, where at least 39 confirmed COVID-19 infections have been recorded.
In Washington DC, the Senate approved a $ 8.3 billion (£ 6.3 billion) measure to help fight the epidemic.
Federal public health agencies would get money for vaccines, tests and potential treatments, including $ 300 million to deliver those drugs to those who need them.
More than $ 2 billion would go to help federal, state and local governments prepare and respond to the coronavirus threat. Another $ 1.3 billion will be used to help fight the virus overseas.
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A school district north of Seattle with 22,000 students will close for up to two weeks due to coronavirus problems.
All 26 schools in the Northshore school district will be closed to prevent the spread of the virus. The district is largely in Bothell, Washington, 20 miles north of Seattle.
The number of confirmed cases of COVID-19, the disease caused by coronavirus, in New York state has doubled from 11 to 22.
The new cases include two patients in hospital in New York City and one man who is in hospital in Nassau County on Long Island.
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