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Epidemiology and Surveillance

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Public Health Weekly Report 2022; 15(25): 1759-1772

Published online June 23, 2022

© The Korea Disease Control and Prevention Agency

Outbreak report of COVID-19 during designation of class 1 infectious disease in the Republic of Korea (January 20, 2020 and April 24, 2022)

Seonhee Ahn, Jinhwa Jang, Shin Young Park, Boyeong Ryu, Seon-Yeong Lee, Eunjeong Shin, Na-Young Kim, HyunJu Lee, Dong Hwi Kim, Myeongsu Yoo, Jonggul Lee, Taeyoung Kim, Ae Ri Kang, Seo Hyun Kim, Seong-Sun Kim, Donghyok Kwon*

Data Analysis Team, Epidemiological Investigation and Analysis Task Force, Central Disease Control Headquarters, Korea Disease Control and Prevention Agency (KDCA)

Abstract

Sections

As the number of confirmed cases of coronavirus disease 2019 (COVID-19) around the world peaked in 2022 and has continued to decline, several countries have eased prevention and control measures against In the Republic of Korea, COVID-19 had been designated as Class 1 Infectious Diseases from January 20, 2020 to April 24, 2022. In consideration of high vaccination rate, introduction of therapeutic agents and the characteristics of variants, COVID-19 has been reclassified to Class 2 Infectious Diseases since April 25, 2022.
Korea Disease Control and Prevention Agency (KDCA) analyzed the characteristics of COVID-19 outbreaks during designation of Class 1 Infectious Disease in the Republic of Korea.
In total, there were 16,929,564 COVID-19 confirmed cases, including 31,828 imported cases during this period. The incidence rate was 32,785 per 100,000 people and the maximum number of confirmed cases per day was 621,177. Severe and critical cases were 22,137 and the case fatality rate was 0.14% with 23,045 death cases. Among all the cases, 9,084,961 (53.8%) occurred in the Seoul metropolitan area (Seoul, Incheon and Gyeonggi Province) and 7,812,775 (46.2%) occured in areas outside the Seoul metropolitan area. Among the confirmed cases, 4,117,327 (24.3%) 18 or under 18 years old, 9,812,940 (58.0%) were between 19-59 years old and those 2,999,299 (17.7%) were 60 or over 60 years old.
Through the lessons learned from pharmacological and non-pharmacological interventions and public health measures for the COVID-19 pandemic, Korean government should prepare for the next COVID-19 resurgence will be caused by new variants or waning of acquired immunity as time passed.

Key words Coronavirus disease 2019 (COVID-19), Incidence rate, Case fatality rate

Sections
Table 1. Epidemiological characteristics COVID-19 confirmed cases by period
Epidemic PeriodThe period of Class 1 infectious disease designationEpidemic period mainly in abroad cases and several regionsEpidemic period mainly in the metropolitan areaEpidemic period mainly in the nationwideEpidemic period mainly in Delta variantEpidemic period mainly in Omicron variant
(January 20, 2020 - April 24, 2022)(January 20, - August 11, 2020)(August 12, - November 12, 2020)(November 13, 2020 - July 6, 2021)(July 7, 2021 - January 29, 2022)(January 30 - April 24, 2022)
TotalPeriod 1Period 2Period 3Period 4Period 5
Confirmed cases (n)16,929,56414,66013,280133,600649,53416,118,490
SexMale7,968,125(47.1%)6,688(45.6%)6,394(48.1%)68,448(51.2%)337,749(52.0%)7,548,846(46.8%)
Female8,961,439(52.9%)7,972(54.4%)6,886(51.9%)65,152(48.8%)311,785(48.0%)8,569,644(53.2%)
Age group, yrs0-184,117,327(24.3%)791(5.4%)1,082(8.1%)15,412(11.5%)134,353(20.7%)3,965,689(24.6%)
19-599,812,940(58.0%)10,380(70.8%)7,809(58.8%)86,415(64.7%)387,351(59.6%)9,320,985(57.8%)
60≤2,999,299(17.7%)3,489(23.8%)4,389(33.0%)31,773(23.8%)127.830(19.7%)2,831,818(17.6%)
NationalityKorean16,512,915(97.5%)13,576(92.6%)12,129(91.3%)123,278(92.3%)589,023(90.7%)15,774,909(97.9%)
Foreigner416,649(2.5%)1,084(7.4%)1,151(8.7%)10,322(7.7%)60,511(9.3%)343,581(2.1%)
Average confirmed cases by period (min – max)20,471.1
(1 - 621,177)		71.5
(1 - 909)		142.8
(38 - 441)		566.1
(191 - 1,240)		3,137.8
(1,049 - 17,509)		187,424.3
(17,075 - 621,177)
Severe /critical cases (daily average)22,137(26.8)375(1.8)575(6.1)3,188(13.5)9,130(44.1)8,869(103.1)
Death cases (Case fatality rate)23,045(0.14%)308(2.10%)221(1.66%)1,556(1.16%)5,061(0.78%)15,899(0.09%)
Local cases16,897,736(99.8%)12,086(82.4%)11,820(89.0%)127,358(95.3%)634,973(97.8%)16,111,499(99.9%)
Seoul metropolitan area9,084,961(53.8%)2,844(23.5%)9,166(77.5%)88,698(69.6%)455,184(71.7%)8,529,069(52.9%)
Seoul3,427,693(20.3%)1,335(11.0%)4,679(39.6%)44,642(35.1%)213,816(33.7%)3,163,221(19.6%)
Incheon1,016,066(6.0%)308(2.5%)648(5.5%)5,607(4.4%)41,372(6.5%)968,131(6.0%)
Gyeonggi4,641,202(27.5%)1,201(9.9%)3,839(32.5%)38,449(30.2%)199,996(31.5%)4,397,717(27.3%)
Areas outside Seoul Metropolitan Area7,812,775(46.2%)9,242(76.5%)2,654(22.5%)38,660(30.4%)179,789(28.3%)7,582,430(47.1%)
Busan1,037,050(6.1%)145(1.2%)401(3.4%)5,566(4.4%)26,025(4.1%)1,004,913(6.2%)
Daegu692,376(4.1%)6,881(56.9%)228(1.9%)3,312(2.6%)20,212(3.2%)661,743(4.1%)
Gwangju491,247(2.9%)182(1.5%)282(2.4%)2,331(1.8%)10,854(1.7%)477,598(3.0%)
Daejeon469,966(2.8%)147(1.2%)265(2.2%)2,312(1.8%)12,832(2.0%)454,410(2.8%)
Ulsan347,432(2.1%)34(0.3%)86(0.7%)2,610(2.0%)5,617(0.9%)339,085(2.1%)
Sejong128,155(0.8%)45(0.4%)19(0.2%)482(0.4%)2,200(0.3%)125,409(0.8%)
Gangwon468,241(2.8%)53(0.4%)249(2.1%)3,186(2.5%)11,623(1.8%)453,130(2.8%)
Chungbuk509,984(3.0%)62(0.5%)94(0.8%)3,031(2.4%)11,044(1.7%)495,753(3.1%)
Chungnam658,258(3.9%)162(1.3%)436(3.7%)3,051(2.4%)19,257(3.0%)635,352(3.9%)
Jeonbuk546,270(3.2%)18(0.1%)105(0.9%)2,133(1.7%)11,346(1.8%)532,668(3.3%)
Jeonnam541,134(3.2%)18(0.1%)142(1.2%)1,411(1.1%)8,554(1.3%)531,009(3.3%)
Gyeongbuk692,979(4.1%)1,374(11.4%)146(1.2%)3,223(2.5%)15,211(2.4%)673,025(4.2%)
Gyeongnam1,011,827(6.0%)110(0.9%)171(1.4%)4,826(3.8%)21,131(3.3%)985,589(6.1%)
Jeju217,856(1.3%)11(0.1%)30(0.3%)1,186(0.9%)3,883(0.6%)212,746(1.3%)
Imported cases31,828(0.2%)2,574(17.6%)1,460(11.0%)6,242(4.7%)14,561(2.2%)6,991(<0.1%)
Characteristics of outbreaks

Daegu·Gyeongbuk, Metropolitan area (Period 1, 2, 3) → A wide area of the entire society (Period 4) → The number of confirmed cases has risen sharply due to Omicron, quarantine system paradigm shift (Period 5)

After the first confirmed case (imported case) on January 20, 2020, starting with the Daegu and Gyeongbuk epidemic related to long-term care facility, church and publicly used facilities

A large number of small to medium sized cluster occurred due to religious facilities in the Seoul metropolitan area, large-scale urban gatherings, and publicly used facilities

Large-scale spread of the epidemic nationwide from the center of the Seoul metropolitan area

Multiple occurrences in correctional facilities, medical institutions, religious facilities, etc.

Start of vaccination

Continued occurrence of confirmed cases in the Seoul metropolitan area

Changes in age of confirmed cases according to vaccination status

Delta → Omicron variant dominant

The number of confirmed cases has risen sharply due to Omicron

95.2% of the total confirmed cases occur in Period 5

High occur in children and adolescents

The introduction of self-writing systems in epidemiological investigation

1) Data as of January 20, 2020 - April 25, 2022, 0:00

2) Monitoring of severe/critical and deaths: as of May 7, 2022

Figure 1. Daily confirmed cases of COVID-19 from January 20, 2020 to April 24, 2022 (Data as of January 20, 2020 - April 25, 2022, 0:00)

Figure 2. Monthly deaths and case fatality rate of COVID-19 from January 20, 2020 to April 24, 2022
(Data: January 20, 2020 - April 25, 2022, 0:00, Monitoring of clinical progress: as of May 7, 2022)

Figure 3. Daily confirmed cases of COVID-19, Period 1 (January 20, - August 11, 2020)

Figure 4. Daily confirmed cases of COVID-19, Period 2 (November 13, 2020 - July 6, 2021)

Figure 5. Daily confirmed cases of COVID-19, Period 3 (November 13, 2020 - July 6, 2021)

Figure 6. Daily confirmed cases of COVID-19, 4 (July 7, 2021 - January 29, 2022)

Figure 7. Daily confirmed cases of COVID-19, Period 5 (January 30, - April 24, 2022)

References

Sections
  1. WHO. COVID-19 Weekly Epidemiological Update(Edition 89, published 27 April 2022)[Internet].
    Available from: https://www.who.int/publications/m/item/weekly-epidemiological-update-on-covid-19---27-april-2022
  2. Central Disease Control Headquarters. Coronavirus (COVID-19), Republic of Korea. http://ncov.mohw.go.kr
  3. 질병관리청. 코로나바이러스감염증-19(COVID-19) 보건의료인용. https://ncv.kdca.go.kr/hcp/page.do
  4. 중앙방역대책본부 보도참고자료(2022. 4. 15.) 사회적 거리두기 조치 약 2년 1개월만에 해제 손씻기, 환기・소독 등 일상 속 감염 차단을 위한 생활방역 수칙 준수 더욱 중요(정례브리핑);
    Available from: https://www.kdca.go.kr/upload_comm/syview/doc.html?fn=165035573164900.pdf&rs=/upload_comm/docu/0015/

Epidemiology and Surveillance

Public Health Weekly Report 2022; 15(25): 1759-1772

Published online June 23, 2022

Copyright © The Korea Disease Control and Prevention Agency.

Outbreak report of COVID-19 during designation of class 1 infectious disease in the Republic of Korea (January 20, 2020 and April 24, 2022)

Seonhee Ahn, Jinhwa Jang, Shin Young Park, Boyeong Ryu, Seon-Yeong Lee, Eunjeong Shin, Na-Young Kim, HyunJu Lee, Dong Hwi Kim, Myeongsu Yoo, Jonggul Lee, Taeyoung Kim, Ae Ri Kang, Seo Hyun Kim, Seong-Sun Kim, Donghyok Kwon*

Data Analysis Team, Epidemiological Investigation and Analysis Task Force, Central Disease Control Headquarters, Korea Disease Control and Prevention Agency (KDCA)

Abstract

As the number of confirmed cases of coronavirus disease 2019 (COVID-19) around the world peaked in 2022 and has continued to decline, several countries have eased prevention and control measures against In the Republic of Korea, COVID-19 had been designated as Class 1 Infectious Diseases from January 20, 2020 to April 24, 2022. In consideration of high vaccination rate, introduction of therapeutic agents and the characteristics of variants, COVID-19 has been reclassified to Class 2 Infectious Diseases since April 25, 2022.
Korea Disease Control and Prevention Agency (KDCA) analyzed the characteristics of COVID-19 outbreaks during designation of Class 1 Infectious Disease in the Republic of Korea.
In total, there were 16,929,564 COVID-19 confirmed cases, including 31,828 imported cases during this period. The incidence rate was 32,785 per 100,000 people and the maximum number of confirmed cases per day was 621,177. Severe and critical cases were 22,137 and the case fatality rate was 0.14% with 23,045 death cases. Among all the cases, 9,084,961 (53.8%) occurred in the Seoul metropolitan area (Seoul, Incheon and Gyeonggi Province) and 7,812,775 (46.2%) occured in areas outside the Seoul metropolitan area. Among the confirmed cases, 4,117,327 (24.3%) 18 or under 18 years old, 9,812,940 (58.0%) were between 19-59 years old and those 2,999,299 (17.7%) were 60 or over 60 years old.
Through the lessons learned from pharmacological and non-pharmacological interventions and public health measures for the COVID-19 pandemic, Korean government should prepare for the next COVID-19 resurgence will be caused by new variants or waning of acquired immunity as time passed.

Keywords: Coronavirus disease 2019 (COVID-19), Incidence rate, Case fatality rate

Body

Epidemiological characteristics COVID-19 confirmed cases by period
Epidemic PeriodThe period of Class 1 infectious disease designationEpidemic period mainly in abroad cases and several regionsEpidemic period mainly in the metropolitan areaEpidemic period mainly in the nationwideEpidemic period mainly in Delta variantEpidemic period mainly in Omicron variant
(January 20, 2020 - April 24, 2022)(January 20, - August 11, 2020)(August 12, - November 12, 2020)(November 13, 2020 - July 6, 2021)(July 7, 2021 - January 29, 2022)(January 30 - April 24, 2022)
TotalPeriod 1Period 2Period 3Period 4Period 5
Confirmed cases (n)16,929,56414,66013,280133,600649,53416,118,490
SexMale7,968,125(47.1%)6,688(45.6%)6,394(48.1%)68,448(51.2%)337,749(52.0%)7,548,846(46.8%)
Female8,961,439(52.9%)7,972(54.4%)6,886(51.9%)65,152(48.8%)311,785(48.0%)8,569,644(53.2%)
Age group, yrs0-184,117,327(24.3%)791(5.4%)1,082(8.1%)15,412(11.5%)134,353(20.7%)3,965,689(24.6%)
19-599,812,940(58.0%)10,380(70.8%)7,809(58.8%)86,415(64.7%)387,351(59.6%)9,320,985(57.8%)
60≤2,999,299(17.7%)3,489(23.8%)4,389(33.0%)31,773(23.8%)127.830(19.7%)2,831,818(17.6%)
NationalityKorean16,512,915(97.5%)13,576(92.6%)12,129(91.3%)123,278(92.3%)589,023(90.7%)15,774,909(97.9%)
Foreigner416,649(2.5%)1,084(7.4%)1,151(8.7%)10,322(7.7%)60,511(9.3%)343,581(2.1%)
Average confirmed cases by period (min – max)20,471.1
(1 - 621,177)		71.5
(1 - 909)		142.8
(38 - 441)		566.1
(191 - 1,240)		3,137.8
(1,049 - 17,509)		187,424.3
(17,075 - 621,177)
Severe /critical cases (daily average)22,137(26.8)375(1.8)575(6.1)3,188(13.5)9,130(44.1)8,869(103.1)
Death cases (Case fatality rate)23,045(0.14%)308(2.10%)221(1.66%)1,556(1.16%)5,061(0.78%)15,899(0.09%)
Local cases16,897,736(99.8%)12,086(82.4%)11,820(89.0%)127,358(95.3%)634,973(97.8%)16,111,499(99.9%)
Seoul metropolitan area9,084,961(53.8%)2,844(23.5%)9,166(77.5%)88,698(69.6%)455,184(71.7%)8,529,069(52.9%)
Seoul3,427,693(20.3%)1,335(11.0%)4,679(39.6%)44,642(35.1%)213,816(33.7%)3,163,221(19.6%)
Incheon1,016,066(6.0%)308(2.5%)648(5.5%)5,607(4.4%)41,372(6.5%)968,131(6.0%)
Gyeonggi4,641,202(27.5%)1,201(9.9%)3,839(32.5%)38,449(30.2%)199,996(31.5%)4,397,717(27.3%)
Areas outside Seoul Metropolitan Area7,812,775(46.2%)9,242(76.5%)2,654(22.5%)38,660(30.4%)179,789(28.3%)7,582,430(47.1%)
Busan1,037,050(6.1%)145(1.2%)401(3.4%)5,566(4.4%)26,025(4.1%)1,004,913(6.2%)
Daegu692,376(4.1%)6,881(56.9%)228(1.9%)3,312(2.6%)20,212(3.2%)661,743(4.1%)
Gwangju491,247(2.9%)182(1.5%)282(2.4%)2,331(1.8%)10,854(1.7%)477,598(3.0%)
Daejeon469,966(2.8%)147(1.2%)265(2.2%)2,312(1.8%)12,832(2.0%)454,410(2.8%)
Ulsan347,432(2.1%)34(0.3%)86(0.7%)2,610(2.0%)5,617(0.9%)339,085(2.1%)
Sejong128,155(0.8%)45(0.4%)19(0.2%)482(0.4%)2,200(0.3%)125,409(0.8%)
Gangwon468,241(2.8%)53(0.4%)249(2.1%)3,186(2.5%)11,623(1.8%)453,130(2.8%)
Chungbuk509,984(3.0%)62(0.5%)94(0.8%)3,031(2.4%)11,044(1.7%)495,753(3.1%)
Chungnam658,258(3.9%)162(1.3%)436(3.7%)3,051(2.4%)19,257(3.0%)635,352(3.9%)
Jeonbuk546,270(3.2%)18(0.1%)105(0.9%)2,133(1.7%)11,346(1.8%)532,668(3.3%)
Jeonnam541,134(3.2%)18(0.1%)142(1.2%)1,411(1.1%)8,554(1.3%)531,009(3.3%)
Gyeongbuk692,979(4.1%)1,374(11.4%)146(1.2%)3,223(2.5%)15,211(2.4%)673,025(4.2%)
Gyeongnam1,011,827(6.0%)110(0.9%)171(1.4%)4,826(3.8%)21,131(3.3%)985,589(6.1%)
Jeju217,856(1.3%)11(0.1%)30(0.3%)1,186(0.9%)3,883(0.6%)212,746(1.3%)
Imported cases31,828(0.2%)2,574(17.6%)1,460(11.0%)6,242(4.7%)14,561(2.2%)6,991(<0.1%)
Characteristics of outbreaks

Daegu·Gyeongbuk, Metropolitan area (Period 1, 2, 3) → A wide area of the entire society (Period 4) → The number of confirmed cases has risen sharply due to Omicron, quarantine system paradigm shift (Period 5).

After the first confirmed case (imported case) on January 20, 2020, starting with the Daegu and Gyeongbuk epidemic related to long-term care facility, church and publicly used facilities.

A large number of small to medium sized cluster occurred due to religious facilities in the Seoul metropolitan area, large-scale urban gatherings, and publicly used facilities.

Large-scale spread of the epidemic nationwide from the center of the Seoul metropolitan area.

Multiple occurrences in correctional facilities, medical institutions, religious facilities, etc..

Start of vaccination.

Continued occurrence of confirmed cases in the Seoul metropolitan area.

Changes in age of confirmed cases according to vaccination status.

Delta → Omicron variant dominant.

The number of confirmed cases has risen sharply due to Omicron.

95.2% of the total confirmed cases occur in Period 5.

High occur in children and adolescents.

The introduction of self-writing systems in epidemiological investigation.

1) Data as of January 20, 2020 - April 25, 2022, 0:00.

2) Monitoring of severe/critical and deaths: as of May 7, 2022.

Figure 1. Daily confirmed cases of COVID-19 from January 20, 2020 to April 24, 2022 (Data as of January 20, 2020 - April 25, 2022, 0:00)

Figure 2. Monthly deaths and case fatality rate of COVID-19 from January 20, 2020 to April 24, 2022
(Data: January 20, 2020 - April 25, 2022, 0:00, Monitoring of clinical progress: as of May 7, 2022)

Figure 3. Daily confirmed cases of COVID-19, Period 1 (January 20, - August 11, 2020)

Figure 4. Daily confirmed cases of COVID-19, Period 2 (November 13, 2020 - July 6, 2021)

Figure 5. Daily confirmed cases of COVID-19, Period 3 (November 13, 2020 - July 6, 2021)

Figure 6. Daily confirmed cases of COVID-19, 4 (July 7, 2021 - January 29, 2022)

Figure 7. Daily confirmed cases of COVID-19, Period 5 (January 30, - April 24, 2022)

Fig 1.

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Figure 1.Daily confirmed cases of COVID-19 from January 20, 2020 to April 24, 2022 (Data as of January 20, 2020 - April 25, 2022, 0:00)
Public Health Weekly Report 2022; 15: 1759-1772

Fig 2.

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Figure 2.Monthly deaths and case fatality rate of COVID-19 from January 20, 2020 to April 24, 2022
(Data: January 20, 2020 - April 25, 2022, 0:00, Monitoring of clinical progress: as of May 7, 2022)
Public Health Weekly Report 2022; 15: 1759-1772

Fig 3.

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Figure 3.Daily confirmed cases of COVID-19, Period 1 (January 20, - August 11, 2020)
Public Health Weekly Report 2022; 15: 1759-1772

Fig 4.

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Figure 4.Daily confirmed cases of COVID-19, Period 2 (November 13, 2020 - July 6, 2021)
Public Health Weekly Report 2022; 15: 1759-1772

Fig 5.

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Figure 5.Daily confirmed cases of COVID-19, Period 3 (November 13, 2020 - July 6, 2021)
Public Health Weekly Report 2022; 15: 1759-1772

Fig 6.

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Figure 6.Daily confirmed cases of COVID-19, 4 (July 7, 2021 - January 29, 2022)
Public Health Weekly Report 2022; 15: 1759-1772

Fig 7.

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Figure 7.Daily confirmed cases of COVID-19, Period 5 (January 30, - April 24, 2022)
Public Health Weekly Report 2022; 15: 1759-1772
Epidemiological characteristics COVID-19 confirmed cases by period
Epidemic PeriodThe period of Class 1 infectious disease designationEpidemic period mainly in abroad cases and several regionsEpidemic period mainly in the metropolitan areaEpidemic period mainly in the nationwideEpidemic period mainly in Delta variantEpidemic period mainly in Omicron variant
(January 20, 2020 - April 24, 2022)(January 20, - August 11, 2020)(August 12, - November 12, 2020)(November 13, 2020 - July 6, 2021)(July 7, 2021 - January 29, 2022)(January 30 - April 24, 2022)
TotalPeriod 1Period 2Period 3Period 4Period 5
Confirmed cases (n)16,929,56414,66013,280133,600649,53416,118,490
SexMale7,968,125(47.1%)6,688(45.6%)6,394(48.1%)68,448(51.2%)337,749(52.0%)7,548,846(46.8%)
Female8,961,439(52.9%)7,972(54.4%)6,886(51.9%)65,152(48.8%)311,785(48.0%)8,569,644(53.2%)
Age group, yrs0-184,117,327(24.3%)791(5.4%)1,082(8.1%)15,412(11.5%)134,353(20.7%)3,965,689(24.6%)
19-599,812,940(58.0%)10,380(70.8%)7,809(58.8%)86,415(64.7%)387,351(59.6%)9,320,985(57.8%)
60≤2,999,299(17.7%)3,489(23.8%)4,389(33.0%)31,773(23.8%)127.830(19.7%)2,831,818(17.6%)
NationalityKorean16,512,915(97.5%)13,576(92.6%)12,129(91.3%)123,278(92.3%)589,023(90.7%)15,774,909(97.9%)
Foreigner416,649(2.5%)1,084(7.4%)1,151(8.7%)10,322(7.7%)60,511(9.3%)343,581(2.1%)
Average confirmed cases by period (min – max)20,471.1
(1 - 621,177)		71.5
(1 - 909)		142.8
(38 - 441)		566.1
(191 - 1,240)		3,137.8
(1,049 - 17,509)		187,424.3
(17,075 - 621,177)
Severe /critical cases (daily average)22,137(26.8)375(1.8)575(6.1)3,188(13.5)9,130(44.1)8,869(103.1)
Death cases (Case fatality rate)23,045(0.14%)308(2.10%)221(1.66%)1,556(1.16%)5,061(0.78%)15,899(0.09%)
Local cases16,897,736(99.8%)12,086(82.4%)11,820(89.0%)127,358(95.3%)634,973(97.8%)16,111,499(99.9%)
Seoul metropolitan area9,084,961(53.8%)2,844(23.5%)9,166(77.5%)88,698(69.6%)455,184(71.7%)8,529,069(52.9%)
Seoul3,427,693(20.3%)1,335(11.0%)4,679(39.6%)44,642(35.1%)213,816(33.7%)3,163,221(19.6%)
Incheon1,016,066(6.0%)308(2.5%)648(5.5%)5,607(4.4%)41,372(6.5%)968,131(6.0%)
Gyeonggi4,641,202(27.5%)1,201(9.9%)3,839(32.5%)38,449(30.2%)199,996(31.5%)4,397,717(27.3%)
Areas outside Seoul Metropolitan Area7,812,775(46.2%)9,242(76.5%)2,654(22.5%)38,660(30.4%)179,789(28.3%)7,582,430(47.1%)
Busan1,037,050(6.1%)145(1.2%)401(3.4%)5,566(4.4%)26,025(4.1%)1,004,913(6.2%)
Daegu692,376(4.1%)6,881(56.9%)228(1.9%)3,312(2.6%)20,212(3.2%)661,743(4.1%)
Gwangju491,247(2.9%)182(1.5%)282(2.4%)2,331(1.8%)10,854(1.7%)477,598(3.0%)
Daejeon469,966(2.8%)147(1.2%)265(2.2%)2,312(1.8%)12,832(2.0%)454,410(2.8%)
Ulsan347,432(2.1%)34(0.3%)86(0.7%)2,610(2.0%)5,617(0.9%)339,085(2.1%)
Sejong128,155(0.8%)45(0.4%)19(0.2%)482(0.4%)2,200(0.3%)125,409(0.8%)
Gangwon468,241(2.8%)53(0.4%)249(2.1%)3,186(2.5%)11,623(1.8%)453,130(2.8%)
Chungbuk509,984(3.0%)62(0.5%)94(0.8%)3,031(2.4%)11,044(1.7%)495,753(3.1%)
Chungnam658,258(3.9%)162(1.3%)436(3.7%)3,051(2.4%)19,257(3.0%)635,352(3.9%)
Jeonbuk546,270(3.2%)18(0.1%)105(0.9%)2,133(1.7%)11,346(1.8%)532,668(3.3%)
Jeonnam541,134(3.2%)18(0.1%)142(1.2%)1,411(1.1%)8,554(1.3%)531,009(3.3%)
Gyeongbuk692,979(4.1%)1,374(11.4%)146(1.2%)3,223(2.5%)15,211(2.4%)673,025(4.2%)
Gyeongnam1,011,827(6.0%)110(0.9%)171(1.4%)4,826(3.8%)21,131(3.3%)985,589(6.1%)
Jeju217,856(1.3%)11(0.1%)30(0.3%)1,186(0.9%)3,883(0.6%)212,746(1.3%)
Imported cases31,828(0.2%)2,574(17.6%)1,460(11.0%)6,242(4.7%)14,561(2.2%)6,991(<0.1%)
Characteristics of outbreaks

Daegu·Gyeongbuk, Metropolitan area (Period 1, 2, 3) → A wide area of the entire society (Period 4) → The number of confirmed cases has risen sharply due to Omicron, quarantine system paradigm shift (Period 5).

After the first confirmed case (imported case) on January 20, 2020, starting with the Daegu and Gyeongbuk epidemic related to long-term care facility, church and publicly used facilities.

A large number of small to medium sized cluster occurred due to religious facilities in the Seoul metropolitan area, large-scale urban gatherings, and publicly used facilities.

Large-scale spread of the epidemic nationwide from the center of the Seoul metropolitan area.

Multiple occurrences in correctional facilities, medical institutions, religious facilities, etc..

Start of vaccination.

Continued occurrence of confirmed cases in the Seoul metropolitan area.

Changes in age of confirmed cases according to vaccination status.

Delta → Omicron variant dominant.

The number of confirmed cases has risen sharply due to Omicron.

95.2% of the total confirmed cases occur in Period 5.

High occur in children and adolescents.

The introduction of self-writing systems in epidemiological investigation.

1) Data as of January 20, 2020 - April 25, 2022, 0:00.

2) Monitoring of severe/critical and deaths: as of May 7, 2022.

References

  1. WHO. COVID-19 Weekly Epidemiological Update(Edition 89, published 27 April 2022)[Internet]. Available from: https://www.who.int/publications/m/item/weekly-epidemiological-update-on-covid-19---27-april-2022
  2. Central Disease Control Headquarters. Coronavirus (COVID-19), Republic of Korea. http://ncov.mohw.go.kr
  3. 질병관리청. 코로나바이러스감염증-19(COVID-19) 보건의료인용. https://ncv.kdca.go.kr/hcp/page.do
  4. 중앙방역대책본부 보도참고자료(2022. 4. 15.) 사회적 거리두기 조치 약 2년 1개월만에 해제 손씻기, 환기・소독 등 일상 속 감염 차단을 위한 생활방역 수칙 준수 더욱 중요(정례브리핑); Available from: https://www.kdca.go.kr/upload_comm/syview/doc.html?fn=165035573164900.pdf&rs=/upload_comm/docu/0015/

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