Four Charts Explain How the Coronavirus Spread

On Jan. 12, a resident of Huanggang caught a train to Zhuhai, on China’s southern coast. She arrived the next morning with a nagging cough, but wrote it off as a cold. A week later, her symptoms worsened. She checked into a Zhuhai hospital on Jan. 19, and at 10 p.m. on Jan. 21, she finally got a diagnosis: the novel coronavirus.
Millions traveled through the epicenter of the outbreak. By the time the alarm was raised, it was too late.

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