University of Michigan - Ann Arbor

By February 21, 2020, 634 people tested positive for SARS-CoV-2 among a total of 3,063 tests. PCR testing was performed, prioritizing symptomatic and high-risk individuals. The following data were collected: PCR results, presence/absence of symptoms, reporting date, number of symptomatic/asymptomatic individuals, demographics (Figure).
The timeline for the proportion of asymptomatic individuals ranged from 16.1% to 50.5% (Table).


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

Mizumoto, K., Kagaya, K., Zarebski, A., & Chowell, G. (2020). Estimating the asymptomatic proportion of coronavirus disease 2019 (COVID-19) cases on board the Diamond Princess cruise ship, Yokohama, Japan, 2020. Eurosurveillance, 25(10), 2000180.
https://doi.org/10.2807/1560-7917.ES.2020.25.10.2000180

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

Table: Data on characteristics, test results for severe acute respiratory syndrome coronavirus 2, and disembarking passengers and crew of the Diamond Princess cruise ship, Yokohama, Japan, February 2020 (n=3,711)

Figure: Age distribution of reported coronavirus disease 2019 cases on board the Diamond Princess cruise ship stratified by sex, Yokohama, Japan, 20 February 2020 (n=634 cases)

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