Restricted Omicron-specific cross-variant memory B-cell immunity after a 3rd dose/booster of monovalent Wuhan-Hu-1-containing COVID-19 mRNA vaccine.
Vaccine
; 42(4): 912-917, 2024 Feb 06.
Article
em En
| MEDLINE
| ID: mdl-38233288
ABSTRACT
The responsiveness/cross-binding of vaccine-induced memory B cells/MBCs to previous and emerging divergent SARS-CoV-2 variants (e.g., Omicron) is understudied. In this longitudinal study subjects receiving two or three doses of monovalent ancestral strain-containing COVID-19 mRNA vaccine were evaluated. In contrast to others, we observed significantly lower frequencies of MBCs reactive to the receptor-binding domain/RBD, the N-terminal domain/NTD, and the S1 of Omicron/BA.1, compared to Wuhan and Delta, even after a 3rd vaccine dose/booster. Our study is a proof of concept that MBC cross-reactivity to variants with greater sequence divergence from the vaccine strain may be overestimated and suggests that these variants may exhibit immune escape with reduced recognition by circulating pre-existing MBCs upon infection.
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MEDLINE
Assunto principal:
Vacinas contra COVID-19
/
COVID-19
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article