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RSV mRNA vaccine (modRNA-LNP) refers to a class of prophylactic vaccines designed to prevent respiratory syncytial virus (RSV) infection using nucleoside-modified messenger RNA (modRNA) encapsulated in lipid nanoparticles (LNPs). The vaccine works by delivering modRNA encoding the RSV fusion (F) protein, typically stabilized in its prefusion conformation (preF), into host cells. Once inside the cells, the host machinery translates the mRNA into the preF antigen, which is then presented to the immune system to elicit robust neutralizing antibody and T-cell responses. This platform is utilized by multiple developers, including Moderna (with its approved vaccine mRESVIA/mRNA-1345) and Pfizer (which has evaluated prototype modRNA-LNP formulations in preclinical studies).
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