[Source: US National Library of Medicine, full page: (LINK). Abstract, edited.]
Euro Surveill, 25 (10) Mar 2020
Estimating the Asymptomatic Proportion of Coronavirus Disease 2019 (COVID-19) Cases on Board the Diamond Princess Cruise Ship, Yokohama, Japan, 2020
Kenji Mizumoto 1 2 3, Katsushi Kagaya 4 2, Alexander Zarebski 5, Gerardo Chowell 1
Affiliations: 1 Department of Population Health Sciences, School of Public Health, Georgia State University, Atlanta, Georgia, United States. 2 Hakubi Center for Advanced Research, Kyoto University, Yoshidahonmachi, Sakyo-ku, Kyoto, Japan. 3 Graduate School of Advanced Integrated Studies in Human Survivability, Kyoto University Yoshida-Nakaadachi-cho, Sakyo-ku, Kyoto, Japan. 4 Seto Marine Biological Laboratory, Field Science, Education and Reseach Center, Kyoto University, Shirahama-cho, Nishimuro-gun, Wakayama, Japan. 5 Department of Zoology, University of Oxford, Oxford, United Kingdom.
PMID: 32183930 DOI: 10.2807/1560-7917.ES.2020.25.10.2000180
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): 15.5-20.2%). Most infections occurred before the quarantine start.
Keywords: COVID-19; Japan; asymptomatic; corona; outbreak; quarantine.
Keywords: SARS-CoV-2; COVID-19; Japan.