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1Division of Infectious Disease Control, Yeongdo-gu Public Health Center, Busan, Korea
2Department of Preventive Medicine, Dong-A University College of Medicine, Busan, Korea
© 2024, Korean Society of Epidemiology
This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Data availability
The datasets are not publicly available but are available from the corresponding author upon reasonable request.
Conflict of interest
The authors have no conflicts of interest to declare for this study.
Funding
None.
Author contributions
Both authors contributed equally to conceiving the study, analyzing the data, and writing this paper.
Category | Exposed individuals (n) | Case (AR) | Confirmed case (AR) |
---|---|---|---|
Total | 165 | 41 (24.8) | 9 (5.5) |
Students | 137 | 41 (29.9) | 9 (6.6) |
School staff | 28 | 0 (0.0) | 0 (0.0) |
Date | Food item | Attack rate (%) | RR (95% CI) | |
---|---|---|---|---|
Ingestion group1 | Non-ingestion group2 | |||
Sep 2 (Sat) Breakfast (07:20–08:00) |
Salted fish | 57.1 (4/7) | 25.0 (37/148) | 2.29 (1.14, 4.60) |
Dried radish | 60.0 (3/5) | 25.3 (38/150) | 2.37 (1.10, 5.10) | |
Sep 4 (Mon) Dinner (16:45–17:45) |
Rice | 32.4 (36/111) | 11.4 (5/44) | 2.85 (1.20, 6.80) |
Boneless chicken | 32.1 (36/112) | 11.6 (5/43) | 2.76 (1.16, 6.58) | |
Spicy beef soup | 31.8 (34/107) | 14.6 (7/48) | 2.18 (1.04, 4.56) | |
Tofu | 34.0 (33/97) | 13.8 (8/58) | 2.47 (1.22, 4.97) | |
Sep 5 (Tue) Late-night snack (21:00–22:00) |
Cup noodles | 40.0 (34/85) | 10.0 (7/70) | 4.00 (1.89, 8.46) |
Sep 6 (Wed) Dinner (16:45–17:45) |
Rice | 34.3 (37/108) | 12.8 (6/47) | 2.68 (1.22, 5.92) |
Hamburger steak | 35.3 (36/102) | 11.3 (6/53) | 3.12 (1.40, 6.92) | |
Frank sausage | 35.7 (35/98) | 12.3 (7/57) | 2.91 (1.38, 6.11) | |
Beef soup | 33.7 (35/104) | 15.7 (8/51) | 2.15 (1.07, 4.28) |
Category | Exposed individuals (n) | Case (AR) | Confirmed case (AR) |
---|---|---|---|
Total | 165 | 41 (24.8) | 9 (5.5) |
Students | 137 | 41 (29.9) | 9 (6.6) |
School staff | 28 | 0 (0.0) | 0 (0.0) |
Date | Food item | Attack rate (%) | RR (95% CI) | |
---|---|---|---|---|
Ingestion group |
Non-ingestion group | |||
Sep 2 (Sat) Breakfast (07:20–08:00) |
Salted fish | 57.1 (4/7) | 25.0 (37/148) | 2.29 (1.14, 4.60) |
Dried radish | 60.0 (3/5) | 25.3 (38/150) | 2.37 (1.10, 5.10) | |
Sep 4 (Mon) Dinner (16:45–17:45) |
Rice | 32.4 (36/111) | 11.4 (5/44) | 2.85 (1.20, 6.80) |
Boneless chicken | 32.1 (36/112) | 11.6 (5/43) | 2.76 (1.16, 6.58) | |
Spicy beef soup | 31.8 (34/107) | 14.6 (7/48) | 2.18 (1.04, 4.56) | |
Tofu | 34.0 (33/97) | 13.8 (8/58) | 2.47 (1.22, 4.97) | |
Sep 5 (Tue) Late-night snack (21:00–22:00) |
Cup noodles | 40.0 (34/85) | 10.0 (7/70) | 4.00 (1.89, 8.46) |
Sep 6 (Wed) Dinner (16:45–17:45) |
Rice | 34.3 (37/108) | 12.8 (6/47) | 2.68 (1.22, 5.92) |
Hamburger steak | 35.3 (36/102) | 11.3 (6/53) | 3.12 (1.40, 6.92) | |
Frank sausage | 35.7 (35/98) | 12.3 (7/57) | 2.91 (1.38, 6.11) | |
Beef soup | 33.7 (35/104) | 15.7 (8/51) | 2.15 (1.07, 4.28) |
Values are presented as number (%).
RR, relative risk; CI, confidence interval. Number of cases/number of people who ingested the food item. Number of cases/number of people who did not ingest the food item.