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

“Estimating the asymptomatic proportion of coronavirus disease 2019 (COVID-19) cases on board the Diamond Princess cruise ship, Yokohama, Japan, 2020” (2020), by Kenji Mizumoto et al. Mathematics research paper. Original abstract below, unchanged. A free PDF is available.

- Authors: Kenji Mizumoto, Katsushi Kagaya, Alexander E. Zarebski, Gerardo Chowell
- Published: March 12, 2020
- Field: Mathematics
- DOI: https://doi.org/10.2807/1560-7917.es.2020.25.10.2000180
- Free PDF: https://www.eurosurveillance.org/deliver/fulltext/eurosurveillance/25/10/eurosurv-25-10-1.pdf?itemId=%2Fcontent%2F10.2807%2F1560-7917.ES.2020.25.10.2000180&mimeType=pdf&containerItemId=content/eurosurveillance

## 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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