Journal
EUROSURVEILLANCE
Volume 25, Issue 10, Pages 2-6Publisher
EUR CENTRE DIS PREVENTION & CONTROL
DOI: 10.2807/1560-7917.ES.2020.25.10.2000180
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Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [18K17368]
- Leading Initiative for Excellent Young Researchers from the Ministry of Education, Culture, Sport, Science & Technology of Japan
- JSPS KAKENHI [18K19336, 19H05330]
- Oxford Martin School Programme on Pandemic Genomics
- NSF as part of the joint NSF-NIH-USDA Ecology and Evolution of Infectious Diseases program [1414374]
- Grants-in-Aid for Scientific Research [18K17368, 18K19336, 19H05330] Funding Source: KAKEN
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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.
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