Global epidemiology of meningococcal disease by serogroup, including serogroup A. Meningococcal serogroups are listed in the order of the estimated incidence (2010–2019) causing disease; however, in some areas, (*) data are quite limited. Serogroups are linked to 12 major genetic clonal complexes currently causing almost invasive meningococcal disease (modified from Stephens, DS, Neisseria meningitidis in Mandell, Douglas, Bennett Principles & Practices of Infectious Diseases, Bennett, Dolin, Blaser, eds.).