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SARS-CoV-2 mRNA Vaccine Elicits Sustained T Cell Responses Against the Omicron Variant in Adolescents

  • Sujin Choi (Department of Pediatrics, Seoul National University Bundang Hospital) ;
  • Sang-Hoon Kim (The Center for Viral Immunology, Korea Virus Research Institute, Institute for Basic Science (IBS)) ;
  • Mi Seon Han (Department of Pediatrics, Seoul National University College of Medicine) ;
  • Yoonsun Yoon (Department of Pediatrics, Korea University Guro Hospital) ;
  • Yun-Kyung Kim (Department of Pediatrics, Korea University College of Medicine) ;
  • Hye-Kyung Cho (Department of Pediatrics, Gil Medical Center, Gachon University College of Medicine) ;
  • Ki Wook Yun (Department of Pediatrics, Seoul National University College of Medicine) ;
  • Seung Ha Song (Department of Pediatrics, Seoul National University College of Medicine) ;
  • Bin Ahn (Department of Pediatrics, Seoul National University College of Medicine) ;
  • Ye Kyung Kim (Department of Pediatrics, Seoul National University College of Medicine) ;
  • Sung Hwan Choi (Department of Pediatrics, Seoul National University Children's Hospital) ;
  • Young June Choe (Department of Pediatrics, Korea University Anam Hospital) ;
  • Heeji Lim (Division of Vaccine Development Coordination, Center for Vaccine Research, National Institute of Infectious Diseases, Korea National Institute of Health, Korea Disease Control and Prevention Agency) ;
  • Eun Bee Choi (Division of Vaccine Development Coordination, Center for Vaccine Research, National Institute of Infectious Diseases, Korea National Institute of Health, Korea Disease Control and Prevention Agency) ;
  • Kwangwook Kim (Division of Vaccine Development Coordination, Center for Vaccine Research, National Institute of Infectious Diseases, Korea National Institute of Health, Korea Disease Control and Prevention Agency) ;
  • Seokhwan Hyeon (Division of Vaccine Development Coordination, Center for Vaccine Research, National Institute of Infectious Diseases, Korea National Institute of Health, Korea Disease Control and Prevention Agency) ;
  • Hye Jung Lim (Division of Vaccine Development Coordination, Center for Vaccine Research, National Institute of Infectious Diseases, Korea National Institute of Health, Korea Disease Control and Prevention Agency) ;
  • Byung-chul Kim (Division of Vaccine Development Coordination, Center for Vaccine Research, National Institute of Infectious Diseases, Korea National Institute of Health, Korea Disease Control and Prevention Agency) ;
  • Yoo-kyoung Lee (Division of Vaccine Development Coordination, Center for Vaccine Research, National Institute of Infectious Diseases, Korea National Institute of Health, Korea Disease Control and Prevention Agency) ;
  • Eun Hwa Choi (Department of Pediatrics, Seoul National University College of Medicine) ;
  • Eui-Cheol Shin (The Center for Viral Immunology, Korea Virus Research Institute, Institute for Basic Science (IBS)) ;
  • Hyunju Lee (Department of Pediatrics, Seoul National University Bundang Hospital)
  • Received : 2023.04.17
  • Accepted : 2023.06.21
  • Published : 2023.08.31

Abstract

Vaccination against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been acknowledged as an effective mean of preventing infection and hospitalization. However, the emergence of highly transmissible SARS-CoV-2 variants of concern (VOCs) has led to substantial increase in infections among children and adolescents. Vaccine-induced immunity and longevity have not been well defined in this population. Therefore, we aimed to analyze humoral and cellular immune responses against ancestral and SARS-CoV-2 variants after two shots of the BNT162b2 vaccine in healthy adolescents. Although vaccination induced a robust increase of spike-specific binding Abs and neutralizing Abs against the ancestral and SARS-CoV-2 variants, the neutralizing activity against the Omicron variant was significantly low. On the contrary, vaccine-induced memory CD4+ T cells exhibited substantial responses against both ancestral and Omicron spike proteins. Notably, CD4+ T cell responses against both ancestral and Omicron strains were preserved at 3 months after two shots of the BNT162b2 vaccine without waning. Polyfunctionality of vaccine-induced memory T cells was also preserved in response to Omicron spike protein. The present findings characterize the protective immunity of vaccination for adolescents in the era of continuous emergence of variants/subvariants.

Keywords

Acknowledgement

This research was funded by the Korea Disease Control and Prevention Agency (No. 2021ER230600) and Institute for Basic Science (IBS), Republic of Korea, under project code IBS-R801-D2.

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