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Volume 27, Number 9—September 2021
Synopsis

Epidemiology of Coronavirus Disease Outbreak among Crewmembers on Cruise Ship, Nagasaki City, Japan, April 2020

Haruka Maeda1, Eiichiro Sando1, Michiko Toizumi1, Yuzo Arima1, Tomoe Shimada, Takeshi Tanaka, Masato Tashiro, Ayumi Fujita, Katsunori Yanagihara, Hayato Takayama, Ikkoh Yasuda, Nobuyuki Kawachi, Yoshitaka Kohayagawa, Maiko Hasegawa, Katsuaki Motomura, Rie Fujita, Katsumi Nakata, Jiro Yasuda, Koichi Morita, Shigeru Kohno, Koichi Izumikawa, Motoi Suzuki2, and Konosuke Morimoto2Comments to Author 
Author affiliations: Nagasaki University, Nagasaki, Japan (H. Maeda, E. Sando, M. Toizumi, T. Tanaka, M. Tashiro, A. Fujita, K. Yanagihara, H. Takayama, I. Yasuda, N. Kawachi, J. Yasuda, K. Morita, S. Kohno, K. Izumikawa, K. Morimoto); Fukushima Medical University, Fukushima, Japan (E. Sando, I. Yasuda); National Institute of Infectious Diseases, Tokyo, Japan (Y. Arima, T. Shimada, M. Suzuki); Disaster Medical Center of Japan, Tokyo (Y. Kohayagawa); Nagasaki Prefecture Government, Nagasaki (M. Hasegawa, K. Nakata); Nagasaki City Public Health Center, Nagasaki (K. Motomura); Northern Nagasaki Public Health Center, Nagasaki (R. Fujita)

Main Article

Table 2

Clinical outcomes of crewmembers on cruise ship where a coronavirus disease outbreak occurred, by SARS-CoV-2 test result, Nagasaki, Japan, 2020*

Clinical outcome† All crewmembers Test-positive Test-negative
Total
 623 (100)
 149 (100)
 474 (100)
Severe pneumonia 1 (0.2) 1 (0.7) 0
Moderate pneumonia 2 (0.3) 2 (1.3) 0
Mild illness 200 (32) 93 (62) 107 (23)
Asymptomatic 420 (67) 53 (36) 367 (77)
Fever (>37.5°C)
 121 (19)
 51 (34)
 70 (15)
Symptom, n = 593‡
Cough 45 (7.6) 32 (23) 13 (2.9)
Nasal congestion 34 (5.7) 23 (17) 11 (2.4)
Sore throat 32 (5.4) 22 (16) 10 (2.2)
Headache 32 (5.4) 18 (13) 14 (3.1)
Olfactory dysfunction 31 (5.2) 25 (18) 6 (1.3)
Taste disorder 28 (4.7) 23 (17) 5 (1.1)
Conjunctival congestion 24 (4.1) 13 (9.5) 11 (2.4)
Diarrhea 16 (2.7) 12 (8.8) 4 (0.9)
Myalgia or arthralgia 13 (2.2) 11 (8.0) 2 (0.4)
Fatigue 11 (1.9) 7 (5.1) 4 (0.9)
Shortness of breath 8 (1.4) 7 (5.1) 1 (0.2)
Nausea or vomiting 5 (0.8) 4 (2.9) 1 (0.2)

*Values are no. (%) except as indicated. SARS-CoV-2, severe acute respiratory coronavirus 2. †Severe pneumonia defined as illness requiring with intubation or intensive care unit admission; moderate pneumonia defined as illness requiring oxygen administration; mild illness defined as illness in patients who had coronavirus disease signs or symptoms without oxygen administration; asymptomatic, no clinical signs or symptoms. Body temperature data were obtained from the ship’s medical records and from the health monitoring system introduced by investigators on April 28, 2020. ‡Among 593 crewmembers who entered data into the health monitoring system introduced by investigators; 137 crewmembers tested positive and 456 tested negative for SARS-CoV-2.

Main Article

1These authors contributed equally to this article.

2These authors were co–principal investigators.

Page created: June 28, 2021
Page updated: August 17, 2021
Page reviewed: August 17, 2021
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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