In Singapore, one of the first places hit by a coronavirus, detectives are tracking down potential positive cases to try to stay one step ahead of the virus. How did they do this and is it too late for the rest of the world?
In mid-January, a group of 20 tourists from the Chinese city of Guangxi arrived in Singapore for Chinese New Year. They visited some of its most glamorous sights.
Also on their itinerary was a non-descript traditional Chinese medicine shop, selling crocodile oil and herbal products. The shop is popular with mainland tourists.
They were served by a dedicated saleswoman who showed them various products, even massaging medicated oil on their arms. The Chinese group finished the tour and went home.
But they had left something behind.

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