Analyze Outbreak Models of Multi-Group Populations with Vaccination // Model infectious disease dynamics in populations with multiple subgroups having different vaccination rates, transmission characteristics, and contact patterns. Calculate final and intermediate outbreak sizes, form age-structured contact models with automatic fetching of U.S. census data, and explore vaccination scenarios with an interactive 'shiny' dashboard for a model with two subgroups, as described in Nguyen et al. (2024) doi:10.1016/j.jval.2024.03.039 and Duong et al. (2026) doi:10.1093/ofid/ofaf695.217.