A Study of Maribavir Pediatric Formulation in Healthy Adult Participants

The study will have 2 parts, Part 1 and Part 2. Participants will only participate in one part. The main aim of Part 1 of this study is to check the ability of a single dose of maribavir pediatric formulation to be absorbed in the digestive tract compared to commercial tablet formulation and to check how a high-fat, high-calorie meal affects absorption, distribution, and elimination of maribavir pediatric formulation given orally as water suspension. The main aim of Part 2 of this study is to assess the stomach acid reducing effect of multiple doses of rabeprazole on absorption, distribution, and elimination of maribavir pediatric formulation given orally as water suspension. Each participant will stay in the study clinic from the day before the first treatment until the day after the last treatment.