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Volume 28, Number 11—November 2022
Research

Effectiveness of Second mRNA COVID-19 Booster Vaccine in Immunocompromised Persons and Long-Term Care Facility Residents

Yoo-Yeon Kim1, Young June Choe1, Jia Kim, Ryu Kyung Kim, Eun Jung Jang, Seon Kyeong Park, Do-Sang Lim, Seonju Yi, Sangwon Lee, Geun-Yong Kwon, Jee Yeon Shin, Sang-Yoon Choi, Mi Jin Jeong, and Young-Joon ParkComments to Author 
Author affiliations: Korea Disease Control and Prevention Agency, Cheongju, South Korea (Y.-Y. Kim, J. Kim, R.K. Kim, E.J. Jang, S.K. Park, D.-S. Lim, S. Yi, S. Lee, G.-Y. Kwon, J.Y. Shin, S.-Y. Choi, M.J. Jeong, Y.-J. Park); Korea University Anam Hospital, Seoul, South Korea (Y.J. Choe)

Main Article

Table 2

Result of booster vaccination among immunocompromised persons and LTCF residents in COVID-19 vaccine effectiveness study, South Korea, February–May 2022*

Characteristics Population
 All infection, no. (%)
 Critical infection, no. (%)
 Death, no. (%)
No. (%)
 Person-days
Total
 972,449
 44,372,598
 313,388
 2,951
 2,441
1st booster 736,439 (75.7) 39,175,439 268,278 (85.6) 2,609 (88.4) 2,148 (88.0)
2nd booster
 236,010 (24.3)
 5,197,160
 45,110 (14.4)
 342 (11.6)
 293 (12.0)
Sex
F 583,013 (60.0) 26,146,920 206,478 (65.9) 1,236 (41.9) 1,474 (60.4)
M
 389,436 (40.0)
 18,225,678
 106,910 (34.1)
 1,715 (58.1)
 967 (39.6)
Age group, y
18–39 41,821 (4.3) 1,806,401 17,391 (5.5) 4 (0.1) 1 (0.0)
40–59 229,379 (23.6) 10,150,253 86,230 (27.5) 97 (3.3) 62 (2.5)
60–74 429,816 (44.2) 20,123,745 117,935 (37.6) 511 (17.3) 335 (13.7)
>75
 271,433 (27.9)
 12,292,199
 91,832 (29.3)
 2,339 (79.3)
 2,043 (83.7)
Location
Metropolitan area 440,460 (45.3) 20,137,934 137,973 (44.0) 1,328 (45.0) 1,012 (41.5)
Nonmetropolitan area
 531,989 (54.7)
 24,234,664
 175,415 (56.0)
 1,623 (55.0)
 1,429 (58.5)
Risk factors
Immunocompromised 574,693 (59.1) 27,697,324 124,950 (39.9) 531 (18.0) 339 (13.9)
LTCF residents 397,756 (40.9)
 16,675,274 188,438 (60.1)
 2,420 (82.0)
 2,102 (86.1)

*LTCF, long-term care facility.

Main Article

1These authors contributed equally to this article.

Page created: September 16, 2022
Page updated: October 21, 2022
Page reviewed: October 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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