Epidemiology of COVID-19 Outbreak on Cruise Ship Quarantined at Yokohama, Japan, February 2020

To improve understanding of coronavirus disease (COVID-19), we assessed the epidemiology of an outbreak on a cruise ship, February 5-24, 2020. The study population included persons on board on February 3 (2,666 passengers, 1,045 crew). Passengers had a mean age of 66.1 years and were 55% female; cre...

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Bibliographic Details
Published in:Emerging infectious diseases 2020-11, Vol.26 (11), p.2591-2597
Main Author: Expert Taskforce for the COVID-19 Cruise Ship Outbreak
Format: Article
Language:English
Subjects:
2019 novel coronavirus disease
Adult
Age
Asymptomatic
Betacoronavirus
Body temperature
Causes of
Coronavirus Infections - epidemiology
Coronavirus Infections - transmission
Coronaviruses
COVID-19
cruise ship
Disease Outbreaks - statistics & numerical data
Disease transmission
Disease Transmission, Infectious - statistics & numerical data
Distribution
Epidemics
Epidemiology
Female
Fever
Humans
Illnesses
Infectious diseases
Japan
Japan - epidemiology
Laboratories
Male
Medical screening
Middle Aged
Occupational Diseases - epidemiology
Occupational Diseases - virology
Pandemics
Passengers
Patients
Pneumonia, Viral - epidemiology
Pneumonia, Viral - transmission
Public health
Quarantine
Quarantine - statistics & numerical data
SARS-CoV-2
Severe acute respiratory syndrome coronavirus 2
Ships
Travel
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Summary:To improve understanding of coronavirus disease (COVID-19), we assessed the epidemiology of an outbreak on a cruise ship, February 5-24, 2020. The study population included persons on board on February 3 (2,666 passengers, 1,045 crew). Passengers had a mean age of 66.1 years and were 55% female; crew had a mean age of 36.6 years and were 81% male. Of passengers, 544 (20.4%) were infected, 314 (57.7%) asymptomatic. Attack rates were highest in 4-person cabins (30.0%; n = 18). Of crew, 143 (13.7%) were infected, 64 (44.8%) asymptomatic. Passenger cases peaked February 7, and 35 had onset before quarantine. Crew cases peaked on February 11 and 13. The median serial interval between cases in the same cabin was 2 days. This study shows that severe acute respiratory syndrome coronavirus 2 is infectious in closed settings, that subclinical infection is common, and that close contact is key for transmission.
ISSN:1080-6040
1080-6059
DOI:10.3201/eid2611.201165