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Volume 11
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10.3390/tropicalmed11060150
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Serological Susceptibility to Measles Among International Students in South Korea After a Cluster of Cases: A Cross-Sectional Study

by
Minyu Qin
1,
Na Young Hong
2,
Shin Woo Kim
3,
Ji Hyuk Park
1,
Seok Ju Yoo
1,
Sung Jun Park
2,
Younjoo Kim
4,
Sang Yun Cho
5,
Sook Hee Park
2,
Hyun Jun Kang
2,
Byeong Ryeon Kim
2,
Mina Lee
4,
Hyejin Hong
4,
Minjei Lee
5,
Myung Jae Hwang
5,
Sookhyun Kim
5,
Myung Hee Kim
6,
Min A. Lim
6,
Youkyoung Kim
6 and
Kwan Lee
1,*
1
Department of Preventive Medicine, College of Medicine, Dongguk University, Gyeongju 38066, Republic of Korea
2
Gyeongbuk Center for Infectious Diseases Control and Prevention, Andong 36759, Republic of Korea
3
Department of Internal Medicine, School of Medicine, Kyungpook National University, 130, Dongdeok-ro, Jung-gu, Daegu 41944, Republic of Korea
4
Daegu Center for Infectious Diseases Control and Prevention, Daegu 41940, Republic of Korea
5
Division of Infectious Disease Response, Gyeongbuk Regional Center for Disease Control and Prevention, Korea Disease Control and Prevention Agency, Daegu 41914, Republic of Korea
6
Division of Public Medicine, Gyeongsangbuk Do Provincial Government, Andong 36759, Republic of Korea
*
Author to whom correspondence should be addressed.
Trop. Med. Infect. Dis. 2026, 11(6), 150; https://doi.org/10.3390/tropicalmed11060150 (registering DOI)
Submission received: 23 April 2026 / Revised: 24 May 2026 / Accepted: 28 May 2026 / Published: 30 May 2026
(This article belongs to the Section Infectious Diseases)
Versions Notes

Abstract

Background: Even though South Korea had eliminated measles in 2006, a localized cluster of measles occurred in a university dormitory in Gyeongsangbuk-do, South Korea, in 2024, involving 22 international students. This study aims to explore measles transmission and to inform future preventive measures. Methods: In a cross-sectional study, 299 international students from two local universities underwent a self-reported questionnaire survey and targeted serological testing by enzyme-linked immunosorbent assay two months after the cluster of measles cases. Statistical analysis used Pearson’s chi-square test, Fisher’s exact test, multivariate logistic regression, and Firth’s penalized logistic regression. Results: The overall seropositivity was 79.6%, and 78.0% among participants aged ≤ 30 years. Among multivariate analyses, nationality was independently associated with seropositivity (aOR up to 8.35 for Chinese students). Conclusions: These findings underscore the immunity gaps among international students, with seropositivity remaining below the 95% threshold required for herd immunity. Targeted serological screening and catch-up vaccination may help to improve immunity in mobile populations.
Keywords: measles; immunoglobulin G; seroepidemiologic studies; vaccination measles; immunoglobulin G; seroepidemiologic studies; vaccination

Share and Cite

MDPI and ACS Style

Qin, M.; Hong, N.Y.; Kim, S.W.; Park, J.H.; Yoo, S.J.; Park, S.J.; Kim, Y.; Cho, S.Y.; Park, S.H.; Kang, H.J.; et al. Serological Susceptibility to Measles Among International Students in South Korea After a Cluster of Cases: A Cross-Sectional Study. Trop. Med. Infect. Dis. 2026, 11, 150. https://doi.org/10.3390/tropicalmed11060150

AMA Style

Qin M, Hong NY, Kim SW, Park JH, Yoo SJ, Park SJ, Kim Y, Cho SY, Park SH, Kang HJ, et al. Serological Susceptibility to Measles Among International Students in South Korea After a Cluster of Cases: A Cross-Sectional Study. Tropical Medicine and Infectious Disease. 2026; 11(6):150. https://doi.org/10.3390/tropicalmed11060150

Chicago/Turabian Style

Qin, Minyu, Na Young Hong, Shin Woo Kim, Ji Hyuk Park, Seok Ju Yoo, Sung Jun Park, Younjoo Kim, Sang Yun Cho, Sook Hee Park, Hyun Jun Kang, and et al. 2026. "Serological Susceptibility to Measles Among International Students in South Korea After a Cluster of Cases: A Cross-Sectional Study" Tropical Medicine and Infectious Disease 11, no. 6: 150. https://doi.org/10.3390/tropicalmed11060150

APA Style

Qin, M., Hong, N. Y., Kim, S. W., Park, J. H., Yoo, S. J., Park, S. J., Kim, Y., Cho, S. Y., Park, S. H., Kang, H. J., Kim, B. R., Lee, M., Hong, H., Lee, M., Hwang, M. J., Kim, S., Kim, M. H., Lim, M. A., Kim, Y., & Lee, K. (2026). Serological Susceptibility to Measles Among International Students in South Korea After a Cluster of Cases: A Cross-Sectional Study. Tropical Medicine and Infectious Disease, 11(6), 150. https://doi.org/10.3390/tropicalmed11060150

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