Some five million people have already left Wuhan, the epicenter of the outbreak — presenting challenges about how to tackle the epidemic.
“It’s definitely too late,” said Jin Dong-Yan, a molecular virologist at Hong Kong University’s School of Biomedical Sciences. “Five million out. That’s a big challenge. Many of them may not come back to Wuhan but hang around somewhere else.”
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Jin said that officials need to find a way to locate travelers who have left Wuhan.
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