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Infectious diseases / Original Article
Cross-neutralizing antibody responses among individuals with or without bivalent vaccine: a six-month prospective cohort study
Hye Hee Cha, Ji Yeun Kim, Seung Beom Kim, Junho Cha, Ji-Soo Kwon, Woori Kim, Ju Yeon Son, Choi Young Jang, Min-Chul Kim, So Yun Lim, Sung-Han Kim
Korean J Intern Med. 2026;41(3):516-523. Published online May 1, 2026
Background/Aims: Although the COVID-19 pandemic has officially ended, SARS-CoV-2 continues to circulate with periodic surges and may exhibit seasonal patterns. Understanding the importance of prompt immunization, particularly in individuals with prior infection, is crucial for developing future vacc..
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Infectious diseases / Original Article
Cytokine profiles associated with persisting symptoms of post-acute sequelae of COVID-19
Ji-Soo Kwon, Euijin Chang, Hyeon Mu Jang, Ji Yeun Kim, Woori Kim, Ju Yeon Son, Junho Cha, Choi Young Jang, Seongman Bae, Jiwon Jung, Min Jae Kim, Yong Pil Chong, Sang-Oh Lee, Sang-Ho Choi, Yang Soo Kim, Sung-Han Kim
Korean J Intern Med. 2025;40(4):667-675. Published online July 1, 2025
Background/Aims: Post-acute sequelae of COVID-19 (PASC) are highly heterogeneous; therefore, the pathophysiological mechanisms for PASC remain unclear. In this study, we aimed to examine the immunologic aspects of various PASC symptoms.
Methods: We prospectively enrolled adults aged ≥ 18 years wh..
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Infectious diseases / Original Article
Comparison of the rapidity of SARS-CoV-2 immune responses between primary and booster vaccination for COVID-19
Ji Yeun Kim, Ji-Soo Kwon, Hye Hee Cha, So Yun Lim, Seongman Bae, Sung-Han Kim
Korean J Intern Med. 2022;37(6):1234-1240. Published online October 11, 2022
Background/Aims: The rapidity of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-specific memory B or T cell response in vaccinated individuals is important for our understanding of immunopathogenesis of coronavirus disease 2019 (COVID-19). We therefore compared the timing of adequate ..
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Infectious diseases / Original Article
Comparison of antibody responses after the 1st and 2nd doses of COVID-19 vaccine with those of patients with mild or severe COVID-19
Hye Hee Cha, So Yun Lim, Ji-Soo Kwon, Ji Yeun Kim, Seongman Bae, Jiwon Jung, Sung-Han Kim
Korean J Intern Med. 2022;37(2):455-459. Published online February 28, 2022
Background/Aims: Data comparing the antibody responses of different coronavirus disease 2019 (COVID-19) vaccine platforms according to dose with natural severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) infection-induced antibody responses are limited.
Methods: Blood samples from adult p..
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