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SARS-CoV-2 infected children form early immune memory responses dominated by nucleocapsid-specific CD8+ T cells and antibodies

Authors :
Karina Lima
Julia C. Fontoura
Priscila Oliveira de Souza
Tiago Fazolo
Gabriel Hilario
Renata Zorzetto
Luiz C Rodrigues Junior
Lais D. Coimbra
Alexandre Borin
Karina Bispo-dos-Santos
Fabiana Granja
Rafael Elias Marques
Gabriela Oliveira Zavaglia
Ingrid Rodrigues Fernandes
Fernanda Hammes Varela
Marcia Polese-Bonatto
Maiko Luís Tonini
Greice Madeleine Ikeda do Carmo
Walquiria Aparecida Ferreira de Almeida
Thiago J. Borges
Helder I. Nakaya
José Luiz Proenca-Modena
Sidia Maria Callegari-Jacques
Marcelo Comerlato Scotta
Renato T. Stein
Cristina Bonorino
Source :
Frontiers in Immunology, Vol 13 (2022)
Publication Year :
2022
Publisher :
Frontiers Media S.A., 2022.

Abstract

This is the third year of the SARS-CoV-2 pandemic, and yet most children remain unvaccinated. COVID-19 in children manifests as mostly mild or asymptomatic, however high viral titers and strong cellular and humoral responses are observed upon acute infection. It is still unclear how long these responses persist, and if they can protect from re-infection and/or disease severity. Here, we analyzed immune memory responses in a cohort of children and adults with COVID-19. Important differences between children and adults are evident in kinetics and profile of memory responses. Children develop early N-specific cytotoxic T cell responses, that rapidly expand and dominate their immune memory to the virus. Children’s anti-N, but not anti-S, antibody titers increase over time. Neutralization titers correlate with N-specific antibodies and CD8+T cells. However, antibodies generated by infection do not efficiently cross-neutralize variants Gamma or Delta. Our results indicate that mechanisms that protect from disease severity are possibly different from those that protect from reinfection, bringing novel insights for pediatric vaccine design. They also underline the importance of vaccination in children, who remain at risk for COVID-19 despite having been previously infected.

Details

Language :
English
ISSN :
16643224
Volume :
13
Database :
Directory of Open Access Journals
Journal :
Frontiers in Immunology
Publication Type :
Academic Journal
Accession number :
edsdoj.88a3c9734cd4a62ccbf6a473123d
Document Type :
article
Full Text :
https://doi.org/10.3389/fimmu.2022.1033364