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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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Author’s correction for Euro Surveill. 2020;25(10)
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2020-03-12
2024-12-27
/content/10.2807/1560-7917.ES.2020.25.10.2000180
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Estimating the asymptomatic proportion of coronavirus disease 2019 (COVID-19) cases on board the Diamond Princess cruise ship, Yokohama, Japan, 2020
<p class="citation"> <span>Citation style for this article:</span> <span class="meta-value authors"> <a href="/search?value1=Kenji+Mizumoto&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Mizumoto Kenji</a>, <a href="/search?value1=Katsushi+Kagaya&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Kagaya Katsushi</a>, <a href="/search?value1=Alexander+Zarebski&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Zarebski Alexander</a>, <a href="/search?value1=Gerardo+Chowell&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Chowell Gerardo</a></span>. Estimating the asymptomatic proportion of coronavirus disease 2019 (COVID-19) cases on board the Diamond Princess cruise ship, Yokohama, Japan, 2020. <a href="/content/ecdc">Euro Surveill.</a> 2020;25(10):pii=2000180. <a href="https://doi.org/10.2807/1560-7917.ES.2020.25.10.2000180" title="doi link" target="_blank">https://doi.org/10.2807/1560-7917.ES.2020.25.10.2000180</a> <span class="ES_Article_citation"> <span class="generated">Received</span>: 20 Feb 2020;&nbsp;&nbsp; <span class="generated">Accepted</span>: 12 Mar 2020 </span> </p>
/content/10.2807/1560-7917.ES.2020.25.10.2000180
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