Since it was first detected in December, in Wuhan, China, the number of known people infected with the coronavirus has ballooned to nearly 6,000, with new cases quickly turning up in Asia, the Americas, and Europe. As of Tuesday, 100 people have died from the illness in China, where the government is scrambling to detect it and contain the spread—speedily erecting hospitals and putting cities on shutdown mode. Other countries are curtailing international travel to China, which has agreed to allow specialists from the World Health Organization to assist in disease mitigation.

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