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Updated: Apr 4, 2026

Intranasal Delivery of mRNA Polyplexes via Rayleigh Breakup Aerosols: An In Vitro Method for Nasal Deposition and Functional Testing
Published on: January 20, 2026
Current status of intranasal and inhaled COVID-19 vaccines
Stephanie Longet1, Stephane Paul2,3,4
1CIRI-Centre International de Recherche en Infectiologie, Team GIMAP, Univ Lyon, Inserm, U1111, CNRS, UMR5308, CIC 1408 Vaccinology, Université Claude Bernard Lyon 1, Saint-Etienne, France. stephanie.longet@univ-st-etienne.fr.
Abstract:
The COVID-19 pandemic has accelerated the development of intranasal and inhaled COVID-19. vaccines. Four vector-based and one adjuvanted protein-based vaccines have been licenced. They have been shown to be safe. However, their ability to induce strong protective mucosal immunity in humans remains to be improved. Diversifying intranasal vaccine platforms, improving the delivery of vaccine components and determining mucosal correlates of protection could help in optimizing intranasal COVID-19 vaccine efficacy.
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