The US has declared a public health emergency over the spread of the coronavirus and said it would deny entry to any foreign nationals who have visited China in the past two weeks.
US citizens returning from Hubei province, where the outbreak started, will be quarantined for 14 days.
Almost 12,000 cases of the new virus have been confirmed, most of them in China, since it emerged in December.
More than 100 cases have been reported outside China, in 22 countries.
On Friday, Beijing said the death toll had risen by 46 to 259 – all of them in China and 249 in Hubei.
Earlier, it emerged that the number of new coronavirus cases worldwide had overtaken that of the Sars epidemic, which spread to more than two dozen countries in 2003.
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