Aboard the Diamond Princess cruise ship, “substantial transmission” of COVID-19 started prior to Feb. 5, when the health ministry quarantined the vessel and asked passengers to stay in their rooms, according to a state-run medical institution that analyzed data related to hundreds of patients.

A preliminary conclusion by the National Institute of Infectious Diseases (NIID) suggests that secondary transmission among passengers during the 14-day quarantine may not have been as rampant as initially feared by some experts.

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