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Background: The US Advisory Committee on Immunization Practices recently developed recommendations for use of a new recombinant zoster vaccine (RZV). Objective: To evaluate the cost-effectiveness of vaccination with RZV compared with zoster vaccine live (ZVL) and no vaccination, the cost-effectiveness of vaccination with RZV for persons who have previously received ZVL, and the cost-effectiveness of preferential vaccination with RZV over ZVL. Design: Simulation (state-transition) model using US epidemiologic, clinical, and cost data. Data Sources: Published data. Target Population: Hypothetical cohort of immunocompetent US adults aged 50 years or older. Time Horizon: Lifetime. Perspective: Societal and health care sector. Intervention: Vaccination with RZV (recommended 2-dose regimen), vaccination with ZVL, and no vaccination. Outcome Measures: The primary outcome measure was the …