Immunogenicity Evaluation of Combination Respiratory Syncytial Virus and Varicella-Zoster Virus mRNA Vaccines in C57BL/6J Mice.

BACKGROUND

Respiratory syncytial virus (RSV) and varicella-zoster virus (VZV) pose significant risks to the elderly and individuals with compromised immune systems. In this study, we investigated whether combining RSV and VZV vaccines could reduce the number of vaccination injections, thereby minimizing discomfort for elderly individuals and reducing manufacturing costs.

METHODS

In this study, we developed two types of combined RSV and VZV mRNA vaccines. Using RSV and VZV mRNA vaccines administered alone as controls, we evaluated the immune response elicited by the combined mRNA vaccines in C57BL/6J mice.

RESULTS

The results demonstrated that RSV mRNA, VZV mRNA, and a mixture of both could be effectively encapsulated in lipid nanoparticles (LNPs) with uniform particle sizes. Compared to the administration of either the RSV or VZV mRNA vaccine alone, the delivery of two kinds of mRNA LNP combination formulation-whether directly mixed or encapsulated two mRNAs in the same LNP formulation-elicited comparable IgG titers, neutralization titers, cell-mediated immunity (CMI), and CD4 T-cell responses.

CONCLUSIONS

In conclusion, this study establishes the feasibility of combining RSV and VZV mRNA-LNP vaccines, laying a solid foundation for clinical trials of combined RSV and VZV vaccines.