Volume 27, Number 9—September 2021
Synopsis
Epidemiology of Coronavirus Disease Outbreak among Crewmembers on Cruise Ship, Nagasaki City, Japan, April 2020
Table 1
Selected characteristics of crewmembers on cruise ship where a coronavirus disease outbreak occurred, by SARS-CoV-2 test result and symptomatic status, Nagasaki, Japan, 2020*
| Characteristic | All crewmembers | Test-positive, n = 149 |
Test-negative, n = 474 |
|||
|---|---|---|---|---|---|---|
| Symptomatic | Asymptomatic | Symptomatic | Asymptomatic | |||
| Total |
623 (100) |
96 (100) |
53 (100) |
107 (100) |
367 (100) |
|
| Age, y | ||||||
| Median (IQR) | 31 (26–40) | 32 (27–39) | 32 (23–42) | 29 (25–35) | 31 (26–41) | |
| Distribution | ||||||
| 10–19 | 3 (0.5) | 1 (1.0) | 1 (1.9) | 0 | 1 (0) | |
| 20–29 | 271 (43) | 37 (39) | 20 (38) | 55 (51) | 159 (43) | |
| 30–39 | 184 (30) | 36 (38) | 14 (26) | 33 (31) | 101 (28) | |
| 40–49 | 123 (20) | 17 (18) | 15 (28) | 13 (12) | 78 (21) | |
| 50–59 | 34 (5.5) | 4 (4.2) | 2 (3.8) | 6 (5.6) | 22 (6.0) | |
| >60 |
8 (1.3) |
1 (1.0) |
1 (1.9) |
0 |
6 (1.6) |
|
| Sex | ||||||
| M | 523 (84) | 82 (85) | 46 (87) | 88 (82) | 307 (84) | |
| F |
100 (16) |
14 (15) |
7 (13) |
19 (18) |
60 (16) |
|
| Nationality | ||||||
| Philippines | 206 (33) | 35 (36) | 6 (11) | 40 (37) | 125 (34) | |
| India | 104 (17) | 16 (17) | 14 (26) | 16 (15) | 58 (16) | |
| Indonesia | 84 (13) | 10 (10) | 13 (25) | 13 (12) | 48 (13) | |
| China | 82 (13) | 14 (15) | 7 (13) | 13 (12) | 48 (13) | |
| Italy | 40 (6.4) | 5 (5.2) | 3 (5.7) | 6 (5.6) | 26 (7.1) | |
| Other |
107 (17) |
16 (17) |
10 (19) |
19 (18) |
62 (17) |
|
| Occupation category | ||||||
| Essential worker | ||||||
| Engine | 75 (12) | 6 (6.3) | 11 (21) | 10 (8.1) | 48 (13) | |
| Hotel | 73 (12) | 13 (14) | 3 (5.7) | 6 (5.0) | 51 (14) | |
| Deck | 70 (11) | 11 (11) | 10 (19) | 11 (9.4) | 38 (10) | |
| Nonessential worker | ||||||
| Restaurant | 96 (15) | 13 (14) | 6 (11) | 21 (20) | 56 (15) | |
| Galley | 77 (12) | 18 (19) | 5 (9.4) | 22 (21) | 32 (8.7) | |
| Housekeeping | 72 (12) | 8 (8.3) | 7 (13) | 7 (6.5) | 50 (14) | |
| Entertainment | 49 (7.9) | 8 (8.3) | 6 (11) | 13 (12) | 22 (6.0) | |
| Technician | 21 (3.4) | 4 (4.2) | 2 (3.8) | 3 (2.8) | 12 (3.3) | |
| Others |
90 (14) |
15 (16) |
3 (5.7) |
14 (13) |
58 (16) |
|
| Smoking history, n = 592† | ||||||
| Yes |
148 (25) |
20 (22) |
13 (28) |
36 (35) |
79 (23) |
|
| Underlying disease, n = 593†‡ | ||||||
| Any | 22 (3.7) | 5 (5.5) | 2 (4.4) | 2 (1.9) | 13 (3.7) | |
| Hypertension | 12 (3.0) | 2 (2.2) | 1 (2.2) | 0 | 9 (2.6) | |
| Diabetes | 10 (1.7) | 1 (1.1) | 1 (2.2) | 0 | 8 (2.3) | |
| Cardiovascular disease | 1 (0.2) | 1 (1.1) | 0 | 0 | 0 | |
| Asthma |
1 (0.2) |
0 |
0 |
1 (1.0) |
0 |
|
| BMI, n = 523† | ||||||
| Median (IQR) | 24.1 (21.7–26.7) | 23.6 (21.3–26.0) | 24.7 (21.6–28.0) | 23.9 (21.3–26.7) | 24.1 (22.0–26.5) | |
| Distribution | ||||||
| Underweight, BMI < 18.5 | 29 (5.5) | 5 (6.2) | 3 (7.5) | 2 (2.0) | 19 (6.3) | |
| Normal, 18.5 < BMI < 25 | 278 (53) | 45 (56) | 18 (45) | 58 (59) | 157 (52) | |
| Overweight, 25 < BMI < 30 | 167 (32) | 22 (27) | 15 (36) | 27 (28) | 103 (34) | |
| Obese, BMI >30 | 49 (9.4) | 9 (11) | 4 (10) | 11 (11) | 25 (8.2) | |
*Values are no. (%) except as indicated. Symptomatic was defined as having any clinical sign or symptom of coronavirus disease (i.e., fever (>37.5°C), cough, shortness of breath, nasal congestion, sore throat, nausea or vomiting, conjunctival congestion, headache, fatigue, myalgia or arthralgia, diarrhea, olfactory dysfunction, or taste disorder [loss of taste]). BMI, body mass index; IQR, interquartile range, SARS-CoV-2, severe acute respiratory coronavirus 2. †Among crewmembers who entered data into the health monitoring system since its introduction on April 28, 2020. ‡Two crewmembers had both hypertension and diabetes.
1These authors contributed equally to this article.
2These authors were co–principal investigators.