A Study to Evaluate the Safety, Reactogenicity, and Immunogenicity of mRNA-1468 in Healthy Adults ≥50 Years of Age

Inclusion Criteria: * Part 1: Is an adult 50 years of age or older at the time of consent. Part 2: Is an adult 50-69 years of age at the time of consent. * Has a body mass index of 18 to \<40 kilograms/meter squared at the Screening Visit. * Females of childbearing potential: have a negative pregnancy test at the Screening Visit and on the day of the first vaccination (Day 1); have practiced adequate contraception or has abstained from all activities that could result in pregnancy for at least 28 days prior to Day 1; have agreed to continue adequate contraception through 3 months following vaccine administration; are not currently breastfeeding. Exclusion Criteria: * Has a history of HZ within the past 10 years. * Has been previously vaccinated against varicella or HZ. * Is acutely ill or febrile * Body temperature ≥38.0°Celsius/100.4°Fahrenheit 72 hours prior to or at the Screening Visit or on Day 1. Participants meeting this criterion may be rescheduled within the allowed window. * Has a current or previous diagnosis of congenital or acquired immunodeficiency, immunocompromizing/immunosuppressive condition, asplenia, or recurrent severe infections. Certain immune-mediated conditions that are well controlled and stable (for example, Hashimoto thyroiditis) as well as those that do not require systemic immunosuppressive therapy (for example, asthma, psoriasis, or vitiligo) may be permitted at the discretion of the Investigator. * Has a dermatologic condition that could affe…