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1Infectious Disease Control Center, Gyeonggi Provincial Government, Suwon, Korea
2Central Disease Control Headquarters, Korea Disease Control and Prevention Agency, Cheongju, Korea
3Regional Center for Disease Control and Prevention, Korea Disease Control and Prevention Agency, Seoul, Korea
4Republic of Korea Armed Forces Medical Command, Korea Army, Seongnam, Korea
5Republic of Korea Army Headquarters, Korea Army, Gyerong, Korea
6Republic of Korea Armed Forces Epidemiologic Investigation Center, Korea Army, Seongnam, Korea
7Center for Preventive Medicine and Public Health, Seoul National University Bundang Hospital, Seongnam, Korea
©2021, 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.
CONFLICT OF INTEREST
The authors have no conflicts of interest to declare for this study.
FUNDING
None.
AUTHOR CONTRIBUTIONS
Conceptualization: CK, YMK. Data curation: NH, EP, SC, SJ, NK, CP. Formal analysis: CK, YMK, NH, EP, SC. Funding acquisition: None. Methodology: CK, YMK, YJP, HL. Visualization: CK, YMK. Writing – original draft: CK, YMK, NH, EP, SC. Writing – review & editing: SJ, NK, DK, YJP, BC, BH, KJ, CP, SP, HL.
Cases | Male | Female | Total | Age, mean±SD | No. of asymptomatic cases |
---|---|---|---|---|---|
Soldiers | 19 | 0 | 19 | 20.58±0.82 | 2 |
Instructors (family) | 1 | 2 | 3 | 51.00±1.41 | 0 |
Total | 20 | 2 | 22 | 24.72±10.48 | 2 |
Unit | Date and duration of event (min) | Mask usage | No. of attendees | No. of confirmed cases | Attack rate (%) | Mean incubation period (range), d | Mean serial interval (range), d | Description of site |
---|---|---|---|---|---|---|---|---|
Career counseling lecture | ||||||||
A | July 14, (D1-3), 90 | None | 138 | 0 | 0.0 | - | - | 450.3 m2, standing A/C, ventilated |
B | July 15, (D1-2), 45 | None | 76 | 0 | 0.0 | - | - | 147.6 m2, standing A/C, ventilated |
C | July 16, (D1-1), 150 | Poor | 25 | 13 | 52.0 | 6.1 (3-7) | 5.1 (2-6) | 81.6 m2, ceiling A/C, not ventilated |
D | July 20, (D1+1, D1+3), 150 | Poor | 27 | 1 | 3.7 | 14.0 (14) | 17.0 (17) | 135 m2, ceiling A/C, not ventilated |
E | July 21, (D1+2, D1+4), 40 | Poor | 57 | 0 | 0.0 | - | - | 252 m2, standing A/C, not ventilated |
Religious activity | July 19, (D2), 40 | Poor | 693 | 3 | 4.4 | 5.5 (5-6) | 5.5 (5-6) | 224.6 m2, standing A/C, not ventilated |
Barrack | - | Poor | 6 | 1 | 16.7 | 3.0 (1-4) | 4.0 (4) | Direct contact with confirmed case in a barrack |
Field-training | - | Poor | - | 1 | - | - | - | Transmission through field training sharing common-use space |
Total | - | - | 398 | 19 | 4.8 | 6.3 (3-14) | 5.8 (2-17) |
A/C, air conditioner.
1 Symptom onset of primary case among lecture-related confirmed cases (the lecturer); e.g., D+1 means that the lecture conducted the day after the symptom onset of the lecturer.
2 Symptom onset of primary case among church-related confirmed cases (the soldier); e.g., D means that the soldier, the source of the church-related transmission, visited the church when the day symptom started.
3 Four cases from Unit C were excluded.
Cases | Male | Female | Total | Age, mean±SD | No. of asymptomatic cases |
---|---|---|---|---|---|
Soldiers | 19 | 0 | 19 | 20.58±0.82 | 2 |
Instructors (family) | 1 | 2 | 3 | 51.00±1.41 | 0 |
Total | 20 | 2 | 22 | 24.72±10.48 | 2 |
Unit | Date and duration of event (min) | Mask usage | No. of attendees | No. of confirmed cases | Attack rate (%) | Mean incubation period (range), d | Mean serial interval (range), d | Description of site |
---|---|---|---|---|---|---|---|---|
Career counseling lecture | ||||||||
A | July 14, (D |
None | 138 | 0 | 0.0 | - | - | 450.3 m2, standing A/C, ventilated |
B | July 15, (D |
None | 76 | 0 | 0.0 | - | - | 147.6 m2, standing A/C, ventilated |
C | July 16, (D |
Poor | 25 | 13 | 52.0 | 6.1 (3-7) | 5.1 (2-6) | 81.6 m2, ceiling A/C, not ventilated |
D | July 20, (D |
Poor | 27 | 1 | 3.7 | 14.0 (14) | 17.0 (17) | 135 m2, ceiling A/C, not ventilated |
E | July 21, (D |
Poor | 57 | 0 | 0.0 | - | - | 252 m2, standing A/C, not ventilated |
Religious activity | July 19, (D |
Poor | 69 |
3 | 4.4 | 5.5 (5-6) | 5.5 (5-6) | 224.6 m2, standing A/C, not ventilated |
Barrack | - | Poor | 6 | 1 | 16.7 | 3.0 (1-4) | 4.0 (4) | Direct contact with confirmed case in a barrack |
Field-training | - | Poor | - | 1 | - | - | - | Transmission through field training sharing common-use space |
Total | - | - | 398 | 19 | 4.8 | 6.3 (3-14) | 5.8 (2-17) |
SD, standard deviation.
A/C, air conditioner. Symptom onset of primary case among lecture-related confirmed cases (the lecturer); e.g., D+1 means that the lecture conducted the day after the symptom onset of the lecturer. Symptom onset of primary case among church-related confirmed cases (the soldier); e.g., D means that the soldier, the source of the church-related transmission, visited the church when the day symptom started. Four cases from Unit C were excluded.