Respiratory mucosal vaccines: Applications, delivery strategies and design considerations

Respiratory mucosal vaccines represent a groundbreaking and promising route to trigger both local and systemic immune responses by mimicking the natural cause of infection, offering great potential for fighting against pathogens and limiting their transmission at entry sites, particularly effective for infectious diseases like Influenza virus and Coronavirus. In this article, we provide a comprehensive overview of recent advance and current landscape of vaccines by mucosal routes, with an emphasis on their design, engineering, and delivery mechanisms across various vaccine platforms. Particular attention is given to the emerging advanced technologies, exosome and lipid nanoparticle vaccine delivery systems. The critical design considerations of mucosal vaccines are highlighted for engineering safe and efficacious mucosal vaccines, proving meaningful insights on the engineering of safe and effective mucosal vaccines. We foresee a promising future for respiratory mucosal vaccines in their translation into clinical applications, ultimately bringing benefits to human individuals.