Safety and Biocompatibility of a Spray-Dried Influenza Microparticle Vaccine in Mice

Area of Science:

• Immunology
• Vaccinology
• Biomaterials Science

Background:

• Influenza virus poses a significant global health threat, necessitating continuous development of effective vaccines.
• Novel vaccine platforms are crucial for overcoming challenges associated with traditional influenza vaccines.

Purpose of the Study:

• To evaluate the safety and biocompatibility of two new polymeric particle-based influenza vaccine formulations.
• To assess potential adverse effects following intranasal and subcutaneous immunization in a mouse model.

Main Methods:

• Mice were immunized with polymeric particle-based influenza vaccines via intranasal or subcutaneous routes.
• Histopathological examination of liver, kidneys, and lungs was performed at 1 hour, 1 day, and 14 days post-immunization.
• Serum biomarker analysis and whole-body plethysmography were used to assess tissue damage and pulmonary function.

Main Results:

• Histopathology revealed only limited inflammation in immunized mice.
• No significant differences were observed in whole-body plethysmography measurements.
• Serum analysis showed no biomarkers (e.g., AST, AlkPhos) indicative of tissue damage.

Conclusions:

• The evaluated polymeric particle-based influenza vaccine formulations demonstrated good tolerability in mice.
• No adverse side effects were induced by the novel vaccine formulations.
• These findings support the potential of these particle-based vaccines for safe and effective influenza control.