Estimating the asymptomatic proportion of coronavirus disease 2019 (COVID-19) cases on board the Diamond Princess cruise ship, Yokohama, Japan, 2020
Kenji Mizumoto, Katsushi Kagaya, Alexander E. Zarebski, Gerardo Chowell
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.
Topics & Concepts
AsymptomaticQuarantineCoronavirus disease 2019 (COVID-19)CruiseSevere acute respiratory syndrome coronavirus 2 (SARS-CoV-2)Medicine2019-20 coronavirus outbreakCoronavirus InfectionsPandemicVirologyInternal medicineDiseaseInfectious disease (medical specialty)OutbreakPathologyEngineeringAerospace engineeringCOVID-19 epidemiological studiesCOVID-19 Pandemic ImpactsTravel-related health issues