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Volume 28, Number 3—March 2022
Research Letter

Serial Intervals and Household Transmission of SARS-CoV-2 Omicron Variant, South Korea, 2021

Jin Su Song1, Jihee Lee1, Miyoung Kim, Hyeong Seop Jeong, Moon Su Kim, Seong Gon Kim, Han Na Yoo, Ji Joo Lee, Hye Young Lee, Sang-Eun Lee, Eun Jin Kim, Jee Eun Rhee, Il Hwan Kim, and Young-Joon ParkComments to Author 
Author affiliations: Capital Regional Center for Disease Control and Prevention, Seoul, South Korea (J.S. Song, J. Lee, M. Kim); Incheon Metropolitan Government, Incheon, South Korea (H.S. Jeong, M.S. Kim, S.G. Kim, H.N. Yoo); Korea Disease Control and Prevention Agency, Cheongju, South Korea (J.J. Lee, H.Y. Lee, S.-E. Lee, E.J. Kim, J.E. Rhee, I.H. Kim, Y.-J. Park)

Main Article

Table

Characteristics of SARS-CoV-2 Omicron (B.1.1.529) variant of concern of index case-patients and household members, South Korea, 2021*

Household Index case-patient
Household members†
Age, y/sex Transmission route Signs/symptoms at diagnosis COVID-19 vaccination status (vaccine)‡ No. members, n = 36 No. confirmed cases, n = 18
1
44/M
Imported case
Cough, sputum, sore throat
Fully (mRNA-1273)

2
1
2
38/M
Contact with a confirmed case at the airport
Fever, cough, myalgia
Unvaccinated

2
1
3
33/M
Contact at church and restaurant
Fever, cough, myalgia, headache
Unvaccinated

1
1
4
39/F
Contact at church
Fever, myalgia
Partially (BNT162b)

1
0
5
31/F
Contact at church
Myalgia
Unvaccinated

0
0
6
27/F
Contact at church
Fever, sore throat
Unvaccinated

1
1
7
33/F
Contact at church
Fever, chill, cough, myalgia, headache
Unvaccinated

2
2
8
34/F
Contact at church
Sore throat
Unvaccinated

2
1
9
50/F
Contact at church
Cough, sore throat, headache
Fully (Ad26.COV2.S)

1
1
10
56/F
Contact with a friend
Cough, fatigue
Fully (Ad26.COV2.S)

0
0
11
46/M
Contact at church
Asymptomatic
Fully (mRNA-1273)

0
0
12
39/F
Contact at a restaurant
Sore throat
Unvaccinated

2
2
13
77/F
Contact at church
Cough, sore throat
Fully (BNT162b)

2
0
14
44/F
Contact at church
Sputum, sore throat
Fully (mRNA-1273)

1
1
15
6/M
Contact at a childcare center
Asymptomatic
Unvaccinated

2
0
16
31/F
Contact at church
Fever, sputum, sore throat
Unvaccinated

1
0
17
23/F
Contact with a friend
Fever, chill, cough, sputum, sore throat, myalgia, headache
Fully (mRNA-1273)

1
0
18
4/M
Contact at street
Asymptomatic
Unvaccinated

3
0
19
64/F
Contact at church
Asymptomatic
Fully (mRNA-1273)

0
0
20
67/F
Contact at church
Asymptomatic
Unvaccinated

1
1
21
34/F
Contact at church
Fever, myalgia
Unvaccinated

1
1
22
33/F
Contact at church
Sore throat, rhinorrhea
Fully (BNT162b)

2
0
23
45/F
Contact with a family member
Asymptomatic
Fully (Ad26.COV2.S)

2
1
24
2/F
Contact at playground
Fever, rhinorrhea
Unvaccinated

4
3
25
3/M
Contact at a childcare center
Asymptomatic
Unvaccinated

2
1
Total

NA
NA
NA

36
18
Attack rate NA NA NA NA 0.50

*COVID-19, coronavirus disease; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2. †Household members who participated in church service on November 28, 2021, were excluded. ‡An unvaccinated person had received no COVID-19 vaccine. A partially vaccinated person had received a COVID-19 vaccine but had not completed the primary series >14 d before illness onset. A fully vaccinated person had completed the primary series of COVID-19 vaccine >14 d before illness onset; vaccinated index case-patients received BNT162b, n = 3; mRNA-1273, n = 5; or Ad26.COV2.S, n = 3.

Main Article

1These authors contributed equally to this article.

Page created: January 26, 2022
Page updated: February 21, 2022
Page reviewed: February 21, 2022
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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