A Study to Learn About a COVID-19 Vaccine in Healthy Adults 50 Through 64 Years of Age

Key Inclusion Criteria - People who are between 50 and 64 years old at their first appointment. - People who are healthy and, based on their medical history and a doctor's judgment, are considered suitable to join the study. Key Exclusion Criteria - People who had COVID-19 in the past 3 months (90 days) before their first visit. - People who got a COVID-19 vaccine, either as part of a research study or an approved vaccine, in the last 3 months-or plans to get one during the study. Always talk to your doctor about whether this trial is right for you.