tetano
Editor, Senior Moderator
Emerg Infect Dis
. 2020 Aug 21;26(11).
doi: 10.3201/eid2611.201165. Online ahead of print.
Epidemiology of COVID-19 Outbreak on Cruise Ship Quarantined at Yokohama, Japan, February 2020
Expert Taskforce for the COVID-19 Cruise Ship Outbreak
Abstract
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.
Keywords: 2019 novel coronavirus disease; COVID-19; Japan; SARS-CoV-2; coronavirus disease; cruise ship; epidemiology; quarantine; severe acute respiratory syndrome coronavirus 2; viruses; zoonoses.
. 2020 Aug 21;26(11).
doi: 10.3201/eid2611.201165. Online ahead of print.
Epidemiology of COVID-19 Outbreak on Cruise Ship Quarantined at Yokohama, Japan, February 2020
Expert Taskforce for the COVID-19 Cruise Ship Outbreak
- PMID: 32822290
- DOI: 10.3201/eid2611.201165
Abstract
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.
Keywords: 2019 novel coronavirus disease; COVID-19; Japan; SARS-CoV-2; coronavirus disease; cruise ship; epidemiology; quarantine; severe acute respiratory syndrome coronavirus 2; viruses; zoonoses.