OBJECTIVE: To use mathematical and economic models to predict the epidemiological and economic impact of vaccination with Bexsero, designed to protect against group B meningococcal disease, to help inform vaccine policy in the United Kingdom.DESIGN: Modelling study.SETTING: England.POPULATION: People aged 0-99.INTERVENTIONS: Incremental impact of introductory vaccine strategies simulated with a transmission dynamic model of meningococcal infection and vaccination including potential herd effects.