He pulled the ship’s itinerary and reconstructed what had happened on board, day by day. The Diamond Princess had left Yokohama on January 20. Five days later it docked in Hong Kong, where an eighty-year-old passenger disembarked. On February 1, the passenger, still in Hong Kong, tested positive for the new coronavirus. The ports for which the cruise ship was headed canceled its certificates of landing. On February 3, the Diamond Princess chugged back into Tokyo Bay and its port of origin. Two days later the first passenger tested positive; two days after that the number of confirmed positives
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