Send to

Choose Destination

See 1 citation found by title matching your search:

Euro Surveill. 2020 Mar;25(10). doi: 10.2807/1560-7917.ES.2020.25.10.2000180.

Estimating the asymptomatic proportion of coronavirus disease 2019 (COVID-19) cases on board the Diamond Princess cruise ship, Yokohama, Japan, 2020.

Author information

Department of Population Health Sciences, School of Public Health, Georgia State University, Atlanta, Georgia, United States.
Hakubi Center for Advanced Research, Kyoto University, Yoshidahonmachi, Sakyo-ku, Kyoto, Japan.
Graduate School of Advanced Integrated Studies in Human Survivability, Kyoto University Yoshida-Nakaadachi-cho, Sakyo-ku, Kyoto, Japan.
Seto Marine Biological Laboratory, Field Science, Education and Reseach Center, Kyoto University, Shirahama-cho, Nishimuro-gun, Wakayama, Japan.
Department of Zoology, University of Oxford, Oxford, United Kingdom.


On 5 February 2020, in Yokohama, Japan, a cruise ship hosting 3,711 people underwent a 2-week quarantine after a former passenger was found with COVID-19 post-disembarking. As at 20 February, 634 persons on board tested positive for the causative virus. We conducted statistical modelling to derive the delay-adjusted asymptomatic proportion of infections, along with the infections' timeline. The estimated asymptomatic proportion was 17.9% (95% credible interval (CrI):ā€‰15.5-20.2%). Most infections occurred before the quarantine start.


COVID-19; Japan; asymptomatic; corona; outbreak; quarantine

[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Ingenta plc Icon for PubMed Central
Loading ...
Support Center