Key result
TAK-214 norovirus vaccine is linked to GII.2 disease protection despite low specific neutralization.
Why the study?
A GII.2 outbreak during an efficacy study provided an opportunity to examine GII.4 homotypic versus GII.2 heterotypic antibody responses to norovirus vaccination and infection.
Does the bivalent human norovirus vaccine TAK-214 induce homotypic and heterotypic neutralizing antibodies in healthy adults?
Observational
Does the bivalent human norovirus vaccine TAK-214 induce homotypic and heterotypic neutralizing antibodies in healthy adults?
The choice of antibody assay can significantly affect the assessment of human norovirus vaccine immunogenicity, as demonstrated by the lack of correlation between homotypic and heterotypic responses.
Genotype-specific assay correlations limit cross-reactivity inferences; leaves open broader efficacy of bivalent norovirus vaccines.
A GII.2 outbreak in an efficacy study of a bivalent virus-like particle norovirus vaccine, TAK-214, in healthy US adults provided an opportunity to examine GII.4 homotypic vs GII.2 heterotypic responses to vaccination and infection. Three serologic assays-virus-like particle binding, histoblood group antigen blocking, and neutralizing-were performed for each genotype. Results were highly correlated within a genotype but not between genotypes. Although the vaccine provided protection from GII.2-associated disease, little GII.2-specific neutralization occurred after vaccination. Choice of antibody assay can affect assessments of human norovirus vaccine immunogenicity.
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Atmar et al. (2023) conducted an observational in Norovirus infection. TAK-214 bivalent virus-like particle norovirus vaccine was evaluated on GII.4 homotypic vs GII.2 heterotypic antibody responses. The TAK-214 bivalent norovirus vaccine protected against GII.2-associated disease despite inducing little GII.2-specific neutralization, showing assay choice affects immunogenicity assessments.
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