A Study to Evaluate the Safety and Immunogenicity of a Single Dose of H1ssF-3928 mRNA-LNP in Healthy Adults

A seasonal quadrivalent inactivated influenza vaccine (IIV4), prepared from influenza viruses propagated in embryonated chicken eggs, protecting against 2 influenza A subtypes and 2 influenza B subtypes.

0.9% Sodium Chloride Injection

The vaccine consists of modified nucleoside messenger RNA (mRNA) encapsulated in lipid nanoparticles (LNP), comprised of four lipid components: (ALC-307 (ionizable lipid), DSPC, cholesterol, and ALC-0159 \[PEG lipid\]).