Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Australia, Modeling Unit, National Center for Immunization and Respiratory Diseases (NCIRD), Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, United States of America, IHRC, Inc., Atlanta, Georgia, United States of America.|Meningitis and Vaccine Preventable Diseases Branch, Division of Bacterial Diseases, NCIRD, CDC, Atlanta, Georgia, United States of America.|Medical Research Council Centre for Outbreak Analysis and Modelling, Imperial College London, London, United Kingdom, Mathematical Modelling of Infectious Diseases Unit, Institut Pasteur, Paris, France.|Kaiser Permanente Southern California, Kaiser Permanente Research, Department of Research & Evaluation, Pasadena, California, United States of America.|Modeling Unit, National Center for Immunization and Respiratory Diseases (NCIRD), Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, United States of America, Office of Science and Integrative Programs, NCIRD, CDC, Atlanta, Georgia, United States of America.|Medical Research Council Centre for Outbreak Analysis and Modelling, Imperial College London, London, United Kingdom.