mRNA Vaccine Targeting Epstein-Barr Virus (EBV) in Healthy Young Adults

Inclusion Criteria: * Aged 18 to 25 years, inclusive * Healthy per medical assessment based on self-reported medical history, physical examination, vital signs, and laboratory assessment Exclusion Criteria: * Self-reported or medically-documented significant medical or psychiatric condition that per medical assessment could interfere with study participation * Likely or confirmed myocarditis or pericarditis * Prior receipt of an investigational EBV vaccine * Prior receipt of a licensed vaccine within 56 days prior to Day 1 * Received more than 10 days of any systemic immunosuppressants or cytotoxic medications within 56 days prior to Day 1, any within 14 days prior to Day 1, or will need immunosuppressants at any time during the study. * For participants of childbearing potential: pregnant, breastfeeding or planning to become pregnant during the study Note: Other inclusion and exclusion criteria apply.