| COVID-19 | coronavirus disease 2019 |
| UTR | untranslated region |
| HAI | hemagglutination inhibition |
| RBD | receptor binding domain |
| IVT | in vitro transcription |
| LNP | lipid nanoparticle |
| RTU LNP | ready-to-use lipid nanoparticle |
| GMT | geometric mean titer |
| ccCVVs | cell culture-based candidate vaccine viruses |
| NIBSC | National Institute for Biological Standards and Control |
| CDC | Centers for Disease Control and Prevention |
| RLU | relative luminescence units |
| TCID50 | Tissue Culture Infectious Dose 50% |
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