Mapping app location data shows how virus spread in China
For weeks after the first reports of a mysterious new virus in Wuhan, millions of people poured out of the central Chinese city, cramming onto buses, trains and planes as the first wave of China's great Lunar New Year migration broke across the nation. Some carried with them the new virus that has since claimed over 8 00 lives and sickened more than 37,000 people.
Officials finally began to seal the borders on Jan. 23. But it was too late. Speaking to reporters a few days after the the city was put under quarantine, the mayor estimated that 5 million people had already left.
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