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

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2020
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Abstract
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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Authors Mizumoto, Kenji;Kagaya, Katsushi;Zarebski, Alexander;Chowell, Gerardo;
Journal euro surveillance : bulletin europeen sur les maladies transmissibles = european communicable disease bulletin
Year 2020
DOI
10.2807/1560-7917.ES.2020.25.10.2000180
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Keywords
outbreak japan quarantine asymptomatic covid-19 corona

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