| CPC A61K 39/12 (2013.01) [A61K 39/155 (2013.01); A61K 39/215 (2013.01); A61P 11/00 (2018.01); A61P 31/14 (2018.01); C07K 16/10 (2013.01); C07K 16/1002 (2023.08); C07K 16/1027 (2013.01); A61K 2039/53 (2013.01); A61K 2039/55511 (2013.01); A61K 2039/55555 (2013.01); A61K 2039/6018 (2013.01); A61K 2039/70 (2013.01); C07K 2317/76 (2013.01); C12N 2760/18034 (2013.01); C12N 2760/18334 (2013.01); C12N 2760/18434 (2013.01); C12N 2760/18534 (2013.01); C12N 2760/18634 (2013.01); C12N 2770/20034 (2013.01); Y02A 50/30 (2018.01)] | 8 Claims | 
| 
               1. A method of vaccinating a human subject against a betacoronavirus, the method comprising administering to the human subject a dose of a vaccine comprising a messenger ribonucleic acid (mRNA) formulated in a lipid nanoparticle comprising 20-60 mol % ionizable cationic lipid, 5-25 mol % neutral lipid, 25-55 mol % cholesterol, and 0.5-15 mol % PEG-modified lipid, wherein the mRNA comprises an open reading frame encoding a full-length betacoronavirus spike protein, wherein the open reading frame comprises nucleosides consisting of N1-methylpseudouridine, adenosine, guanosine, and cytidine, wherein the dose is administered intramuscularly and comprises from 20-50 μg of the mRNA, and wherein the vaccine has an efficacy against betacoronavirus infection of at least 90%, wherein betacoronavirus infection is determined using polymerase chain reaction (PCR). 
             |