An extraordinary two-week quarantine of the Diamond Princess cruise ship ends Wednesday, with thousands of passengers and crew set to disembark over the next several days in the port of Yokohama, near Tokyo.
A growing number of scientists, however, say the the ship served as an incubator for a worrying new virus from China instead of a quarantine facility meant to prevent the worsening of an outbreak that has sickened tens of thousands.
As of Tuesday, 542 cases of the virus have been identified among the 3,711 quarantined passengers and crew, making the ship the site of the most infections outside of China.
The question now is: Why?