Transmission routes of Covid-19 virus in the Diamond Princess Cruise ship

Pengcheng Xu; Hua Qian; Te Miao; Hui-ling Yen; Hongwei Tan; Benjamin J. Cowling; Yuguo J Li

We collected the daily number of 197 symptomatic cases from Jan 20 to Feb 18 and retrieved data of the implemented quarantine measures and implementation schedules from the Ministry of Health, Labour and Welfare, japan website (MHLW, 2020a). We also extracted from the same website the data of 146 passenger cases including 129 in the "close contact" category, i.e. those who stayed in the same stateroom with infected individuals (s) and 17 in "non-close contact", i.e. those who did not stay in the same stateroom with infected. We obtained the itinerary of the ship from Yutaka Club Cruises International (2020). We searched the websites of national/local health authority in Vietnam, Hong Kong and Taiwan, and their local news using Google along the cruise routes for locally confirmed cases associated with the ship. We also obtained the basic data of the ship such as space ratio, number and size of staterooms from Cruisedeckplans (2020). The air conditioning design of the ship was obtained from Kosako and Shiiyama (2008) and the waste and sewage treatment system design from Onoguchi et al (2004) .