ArticlebioRxiv : the preprint server for biology2025
Local B-cell immunity and durable memory following live-attenuated influenza intranasal vaccination of humans.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Seasonal influenza vaccines are most frequently delivered as intramuscular inactivated vaccines which elicit systemic responses against the immunodominant hemagglutinin (HA) head domain. An intranasally administered, live-attenuated influenza vaccine designed to stimulate mucosal immunity, FluMist, is the sole intranasal vaccine approved in the United States. However, FluMist has lower systemic immunogenicity and efficacy in adults compared to intramuscular formulations. In this study, human mucosal and systemic immunity were examined following seasonal intramuscular or intranasal vaccination. Nasopharyngeal swabs of adenoid tissue were used to longitudinally sample the upper airway. Notably, FluMist induced substantial increases in upper respiratory tract IgG One Sentence Summary: Longitudinal nasopharyngeal sampling reveals local influenza-specific B cell responses following intranasal but not intramuscular vaccination.
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