The U.K. on Monday declared the virus a "serious and imminent" threat to public health, a measure that allows for the forcible quarantining of people suspected of carrying the disease. That follows growing fears of 'superspreader' events, illustrated by the confirmation of five cases in a French ski resort at the end of last week. The disease's symptoms can remain undetected for 14 days, and the cases in the resort were traced back to a single British business traveller to Singapore, who had apparently re-entered the U.K. while showing no symptoms.
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