RSV-A and RSV-B Show Distinct Antibody Susceptibility Patterns Despite Vaccine Development
A new study of 133 RSV clinical samples from 2022-2024 found that RSV-A and RSV-B subtypes differ in their susceptibility to monoclonal antibodies and vaccine-induced immunity. RSV-A isolates were less susceptible to multiple antibodies than RSV-B, and antibodies from RSV-A vaccination showed reduced effectiveness against contemporary RSV-B strains. The findings suggest that multivalent vaccines targeting both subtypes may be necessary to overcome subtype-specific immune responses.
Researchers analyzed viral genome sequences and conducted phenotypic testing on representative RSV isolates collected during the 2022-2023 and 2023-2024 seasons to understand how current monoclonal antibodies and vaccines perform against circulating strains. While all isolates retained sensitivity to the monoclonal antibodies tested and no mutations were detected in antibody binding sites, the study revealed important antigenic differences between subtypes: RSV-A isolates clustered together with lower neutralization by certain antibodies like MPE8 and 101F, while RSV-B isolates formed a distinct cluster with higher susceptibility. In animal models, vaccination with RSV-A alone produced strong responses to RSV-A strains but diminished activity against contemporary RSV-B isolates, whereas RSV-B vaccination showed more balanced neutralization across both subtypes. Combined RSV-A and RSV-B immunization produced uniformly strong responses to all isolates tested, suggesting that multivalent vaccine approaches may overcome the subtype-specific antibody polarization observed with single-subtype exposure.
Limitations & open questions
The study's limitations include reliance on a rabbit vaccination model rather than human data, which may not fully reflect immune responses in vaccinated or naturally infected humans; the sample size of 8 isolates selected for phenotypic testing from 133 sequenced samples; and the lack of data on how these findings translate to clinical protection or real-world vaccine effectiveness.
What different sources said
- bioRxivCenter
Subtype-specific differences in susceptibility to monoclonal antibodies and vaccines among contemporary RSV-A and RSV-B isolates
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