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1Busan Center for Infectious Disease Control and Prevention, Busan National University Hospital, Busan, Korea
2Epidemic Investigation Team of Busan Metropolitan City, Busan, Korea
3Division of Health Promotion, Busan Metropolitan City, Busan, Korea
4Division of Microbiology, Busan Institute of Health and Environment, Busan, Korea
©2019, Korean Society of Epidemiology
This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
School | No. of cases |
Symptom1 |
||||
---|---|---|---|---|---|---|
Diarrhea | Abdominal pain | Febrile sensation | Vomiting | Headache | ||
A | 147 | 141 (95.9) | 132 (89.8) | 52 (35.4) | 31 (21.1) | 14 (9.5) |
B | 127 | 120 (94.5) | 117 (92.1) | 88 (69.3) | 40 (31.5) | 0 (0.0) |
C | 93 | 86 (92.5) | 44 (47.3) | 19 (20.4) | 52 (55.9) | 7 (7.5) |
D | 145 | 145 (100) | 135 (93.1) | 47 (32.4) | 17 (11.7) | 0 (0.0) |
E | 15 | 14 (93.3) | 3 (20.0) | 4 (26.7) | 10 (66.7) | 0 (0.0) |
F | 157 | 153 (97.5) | 127 (80.9) | 83 (52.9) | 24 (15.3) | 0 (0.0) |
G | 170 | 163 (95.9) | 161 (94.7) | 71 (41.8) | 42 (24.7) | 0 (0.0) |
H | 45 | 42 (93.3) | 41 (91.1) | 25 (55.6) | 8 (17.8) | 0 (0.0) |
I | 86 | 86 (100) | 67 (77.9) | 33 (38.4) | 7 (8.1) | 0 (0.0) |
J | 126 | 101 (80.2) | 104 (82.5) | 80 (63.5) | 44 (34.9) | 0 (0.0) |
Total | 1,111 | 1,051 (94.6) | 931 (83.8) | 502 (45.2) | 275 (24.8) | 21 (1.9) |
School | Food | Date of ingestion |
Case |
Control |
OR (95% CI)1 | ||
---|---|---|---|---|---|---|---|
Ingestion | Non-ingestion | Ingestion | Non-ingestion | ||||
A | Seasoned mung bean sprouts | 03-Sep (lunch) | 46 (70.8) | 19 (29.2) | 67 (54.5) | 56 (45.5) | 2.0 (1.1, 3.8) |
Chocolate cake | 03-Sep (lunch) | 63 (95.5) | 3 (4.5) | 106 (84.1) | 20 (15.9) | 4.0 (1.1, 13.9) | |
B | Mushroom soybean paste stew | 31-Aug (lunch) | 30 (37.5) | 50 (62.5) | 43 (24.7) | 131 (75.3) | 1.8 (1.0, 3.2) |
Vegetable side dishes | 03-Sep (lunch) | 46 (58.2) | 33 (41.8) | 76 (42.5) | 103 (57.5) | 1.9 (1.1, 3.2) | |
F | Diced radish kimchi | 03-Sep (lunch) | 53 (63.9) | 30 (36.1) | 107 (43.5) | 139 (56.5) | 2.3 (1.4, 3.8) |
Diced radish kimchi | 03-Sep (dinner) | 25 (30.1) | 58 (69.9) | 47 (19.1) | 199 (80.9) | 1.8 (1.0, 3.2) | |
Rice with bean | 04-Sep (lunch) | 81 (97.6) | 2 (2.4) | 219 (89.0) | 27 (11.0) | 5.0 (1.2, 21.5) | |
Abalone seaweed soup | 04-Sep (lunch) | 70 (84.3) | 13 (15.7) | 173 (70.3) | 73 (29.7) | 2.3 (1.2, 4.4) | |
Braised pork and ripe kimchi | 04-Sep (lunch) | 81 (97.6) | 2 (2.4) | 195 (79.3) | 51 (20.7) | 10.6 (2.5, 44.5) | |
Squid chive pancake | 04-Sep (lunch) | 69 (83.1) | 14 (16.9) | 165 (67.1) | 81 (32.9) | 2.4 (1.3, 4.6) | |
Sesame leaves in soy sauce | 04-Sep (lunch) | 65 (78.3) | 18 (21.7) | 157 (63.8) | 89 (36.2) | 2.0 (1.1, 3.7) | |
Chocolate cake | 04-Sep (lunch) | 92 (97.9) | 2 (2.1) | 207 (84.1) | 39 (15.9) | 8.7 (2.0, 36.7) | |
G | Brown rice and boiled glutinous rice | 04-Sep (lunch) | 86 (96.6) | 3 (3.4) | 153 (78.9) | 41 (21.1) | 7.7 (2.3, 25.5) |
Stir-fried octopus | 04-Sep (lunch) | 82 (92.1) | 7 (7.9) | 149 (76.8) | 45 (23.2) | 3.5 (1.5, 8.2) | |
Vegetables rolled omelet | 04-Sep (lunch) | 85 (95.5) | 4 (4.5) | 148 (77.5) | 43 (22.5) | 6.2 (2.1, 17.8) | |
Chocolate cake | 04-Sep (lunch) | 88 (98.9) | 1 (1.1) | 134 (69.1) | 60 (30.9) | 39.4 (5.4, 289.5) | |
I | Red bean rice | 04-Sep (lunch) | 67 (98.5) | 1 (1.5) | 70 (88.6) | 9 (11.4) | 8.6 (1.1, 69.9) |
Beef and seaweed soup | 04-Sep (lunch) | 63 (92.6) | 5 (7.4) | 59 (76.6) | 18 (23.4) | 3.8 (1.3, 11.0) | |
Andong braised chicken | 04-Sep (lunch) | 68 (100) | 0 (0.0) | 69 (87.3) | 10 (12.7) | 20.6 (1.2, 360.2) | |
Chocolate cake | 04-Sep (lunch) | 68 (100) | 0 (0.0) | 65 (82.3) | 14 (17.7) | 30.3 (1.8, 518.8) | |
J | Chocolate cake | 04-Sep (lunch) | 90 (96.8) | 3 (3.2) | 371 (88.3) | 49 (11.7) | 4.0 (1.2, 13.0) |
School | Total (n)a |
Tested cases |
Confirmed cases1 |
||
---|---|---|---|---|---|
nb | b/a (%) | nc | c/b (%) | ||
A | 147 | 34 | 23.1 | 20 | 58.8 |
B | 127 | 35 | 27.6 | 15 | 42.9 |
C | 93 | 55 | 59.1 | 23 | 41.8 |
D | 145 | 6 | 4.1 | 5 | 83.3 |
E | 15 | 3 | 20.0 | 0 | 0.0 |
F | 157 | 23 | 14.6 | 7 | 30.4 |
G | 170 | 9 | 5.3 | 1 | 11.1 |
H | 45 | 21 | 46.7 | 9 | 42.9 |
I | 86 | 6 | 7.0 | 2 | 33.3 |
J | 126 | 13 | 10.3 | 7 | 53.8 |
Total | 1,111 | 205 | 18.5 | 89 | 43.4 |
School | Total | Cases | Student |
School personnel |
Foodservice employee |
|||
---|---|---|---|---|---|---|---|---|
Total | Cases | Total | Cases | Total | Cases | |||
A | 679 | 147 (21.6) | 599 | 139 (23.2) | 73 | 8 (11.0) | 7 | 0 (0.0) |
B | 710 | 127 (17.9) | 650 | 121 (18.6) | 53 | 3 (5.7) | 7 | 3 (42.9) |
C | 484 | 93 (19.2) | 429 | 91 (21.2) | 50 | 2 (4.0) | 5 | 0 (0.0) |
D | 484 | 145 (30.0) | 424 | 138 (32.5) | 52 | 7 (13.5) | 8 | 0 (0.0) |
E | 302 | 15 (5.0) | 267 | 15 (5.6) | 31 | 0 (0.0) | 4 | 0 (0.0) |
F | 788 | 157 (19.9) | 718 | 157 (21.9) | 63 | 0 (0.0) | 7 | 0 (0.0) |
G | 516 | 170 (32.9) | 457 | 167 (36.5) | 53 | 2 (3.8) | 6 | 1 (16.7) |
H | 837 | 45 (5.4) | 778 | 45 (5.8) | 52 | 0 (0.0) | 7 | 0 (0.0) |
I | 289 | 86 (29.8) | 242 | 86 (35.5) | 43 | 0 (0.0) | 4 | 0 (0.0) |
J | 940 | 126 (13.4) | 880 | 124 (14.1) | 53 | 0 (0.0) | 7 | 2 (28.6) |
Total | 6,029 | 1,111(18.4) | 5,444 | 1,083 (19.9) | 523 | 22 (4.2) | 62 | 6 (9.7) |
School | No. of cases | Symptom |
||||
---|---|---|---|---|---|---|
Diarrhea | Abdominal pain | Febrile sensation | Vomiting | Headache | ||
A | 147 | 141 (95.9) | 132 (89.8) | 52 (35.4) | 31 (21.1) | 14 (9.5) |
B | 127 | 120 (94.5) | 117 (92.1) | 88 (69.3) | 40 (31.5) | 0 (0.0) |
C | 93 | 86 (92.5) | 44 (47.3) | 19 (20.4) | 52 (55.9) | 7 (7.5) |
D | 145 | 145 (100) | 135 (93.1) | 47 (32.4) | 17 (11.7) | 0 (0.0) |
E | 15 | 14 (93.3) | 3 (20.0) | 4 (26.7) | 10 (66.7) | 0 (0.0) |
F | 157 | 153 (97.5) | 127 (80.9) | 83 (52.9) | 24 (15.3) | 0 (0.0) |
G | 170 | 163 (95.9) | 161 (94.7) | 71 (41.8) | 42 (24.7) | 0 (0.0) |
H | 45 | 42 (93.3) | 41 (91.1) | 25 (55.6) | 8 (17.8) | 0 (0.0) |
I | 86 | 86 (100) | 67 (77.9) | 33 (38.4) | 7 (8.1) | 0 (0.0) |
J | 126 | 101 (80.2) | 104 (82.5) | 80 (63.5) | 44 (34.9) | 0 (0.0) |
Total | 1,111 | 1,051 (94.6) | 931 (83.8) | 502 (45.2) | 275 (24.8) | 21 (1.9) |
School | No. of cases | Hospitalized cases | Student | School personnel | Mean duration of hospitalization (d) |
---|---|---|---|---|---|
A | 147 | 31 (21.1) | 30 | 1 | 6.2 |
B | 127 | 7 (5.5) | 7 | 0 | 4.9 |
C | 93 | 27 (29.0) | 27 | 0 | 4.3 |
D | 145 | 23 (15.9) | 23 | 0 | 6.6 |
E | 15 | 11 (73.3) | 11 | 0 | 7.7 |
F | 157 | 7 (4.5) | 7 | 0 | 2.3 |
G | 170 | 23 (13.5) | 22 | 1 | 6.0 |
H | 45 | 8 (17.8) | 8 | 0 | 4.0 |
I | 86 | 5 (5.8) | 5 | 0 | 4.2 |
J | 126 | 9 (7.1) | 9 | 0 | 3.7 |
Total | 1,111 | 151 (13.6) | 149 | 2 | 5.0 |
School | Food | Date of ingestion | Case |
Control |
OR (95% CI) |
||
---|---|---|---|---|---|---|---|
Ingestion | Non-ingestion | Ingestion | Non-ingestion | ||||
A | Seasoned mung bean sprouts | 03-Sep (lunch) | 46 (70.8) | 19 (29.2) | 67 (54.5) | 56 (45.5) | 2.0 (1.1, 3.8) |
Chocolate cake | 03-Sep (lunch) | 63 (95.5) | 3 (4.5) | 106 (84.1) | 20 (15.9) | 4.0 (1.1, 13.9) | |
B | Mushroom soybean paste stew | 31-Aug (lunch) | 30 (37.5) | 50 (62.5) | 43 (24.7) | 131 (75.3) | 1.8 (1.0, 3.2) |
Vegetable side dishes | 03-Sep (lunch) | 46 (58.2) | 33 (41.8) | 76 (42.5) | 103 (57.5) | 1.9 (1.1, 3.2) | |
F | Diced radish kimchi | 03-Sep (lunch) | 53 (63.9) | 30 (36.1) | 107 (43.5) | 139 (56.5) | 2.3 (1.4, 3.8) |
Diced radish kimchi | 03-Sep (dinner) | 25 (30.1) | 58 (69.9) | 47 (19.1) | 199 (80.9) | 1.8 (1.0, 3.2) | |
Rice with bean | 04-Sep (lunch) | 81 (97.6) | 2 (2.4) | 219 (89.0) | 27 (11.0) | 5.0 (1.2, 21.5) | |
Abalone seaweed soup | 04-Sep (lunch) | 70 (84.3) | 13 (15.7) | 173 (70.3) | 73 (29.7) | 2.3 (1.2, 4.4) | |
Braised pork and ripe kimchi | 04-Sep (lunch) | 81 (97.6) | 2 (2.4) | 195 (79.3) | 51 (20.7) | 10.6 (2.5, 44.5) | |
Squid chive pancake | 04-Sep (lunch) | 69 (83.1) | 14 (16.9) | 165 (67.1) | 81 (32.9) | 2.4 (1.3, 4.6) | |
Sesame leaves in soy sauce | 04-Sep (lunch) | 65 (78.3) | 18 (21.7) | 157 (63.8) | 89 (36.2) | 2.0 (1.1, 3.7) | |
Chocolate cake | 04-Sep (lunch) | 92 (97.9) | 2 (2.1) | 207 (84.1) | 39 (15.9) | 8.7 (2.0, 36.7) | |
G | Brown rice and boiled glutinous rice | 04-Sep (lunch) | 86 (96.6) | 3 (3.4) | 153 (78.9) | 41 (21.1) | 7.7 (2.3, 25.5) |
Stir-fried octopus | 04-Sep (lunch) | 82 (92.1) | 7 (7.9) | 149 (76.8) | 45 (23.2) | 3.5 (1.5, 8.2) | |
Vegetables rolled omelet | 04-Sep (lunch) | 85 (95.5) | 4 (4.5) | 148 (77.5) | 43 (22.5) | 6.2 (2.1, 17.8) | |
Chocolate cake | 04-Sep (lunch) | 88 (98.9) | 1 (1.1) | 134 (69.1) | 60 (30.9) | 39.4 (5.4, 289.5) | |
I | Red bean rice | 04-Sep (lunch) | 67 (98.5) | 1 (1.5) | 70 (88.6) | 9 (11.4) | 8.6 (1.1, 69.9) |
Beef and seaweed soup | 04-Sep (lunch) | 63 (92.6) | 5 (7.4) | 59 (76.6) | 18 (23.4) | 3.8 (1.3, 11.0) | |
Andong braised chicken | 04-Sep (lunch) | 68 (100) | 0 (0.0) | 69 (87.3) | 10 (12.7) | 20.6 (1.2, 360.2) | |
Chocolate cake | 04-Sep (lunch) | 68 (100) | 0 (0.0) | 65 (82.3) | 14 (17.7) | 30.3 (1.8, 518.8) | |
J | Chocolate cake | 04-Sep (lunch) | 90 (96.8) | 3 (3.2) | 371 (88.3) | 49 (11.7) | 4.0 (1.2, 13.0) |
School | Total (n)a | Tested cases |
Confirmed cases |
||
---|---|---|---|---|---|
nb | b/a (%) | nc | c/b (%) | ||
A | 147 | 34 | 23.1 | 20 | 58.8 |
B | 127 | 35 | 27.6 | 15 | 42.9 |
C | 93 | 55 | 59.1 | 23 | 41.8 |
D | 145 | 6 | 4.1 | 5 | 83.3 |
E | 15 | 3 | 20.0 | 0 | 0.0 |
F | 157 | 23 | 14.6 | 7 | 30.4 |
G | 170 | 9 | 5.3 | 1 | 11.1 |
H | 45 | 21 | 46.7 | 9 | 42.9 |
I | 86 | 6 | 7.0 | 2 | 33.3 |
J | 126 | 13 | 10.3 | 7 | 53.8 |
Total | 1,111 | 205 | 18.5 | 89 | 43.4 |
Values are presented as number or number (%).
Values are presented as number (%). Respondents could select multiple choices.
Values are presented as number or number (%).
Values are presented as number (%). OR, odds ratio; CI, confidence interval. In case the counts of each cell contains zero, the OR and 95% CI were calculated by adding 0.5 to each cell.