For instance, while N. meningitides groups B and C cause most disease episodes in Europe, group A is found in Asia and continues to predominate in Africa, where it causes most of the major epidemics in the meningitis belt, accounting for about 80% to 85% of documented meningococcal meningitis cases.
Contohnya, N. meningitides grup B dan C menyebabkan kebanyakan penyakit di Eropa, sedangkan grup A ditemukan di Asia dan selalu menonjol di Afrika, di mana bakteri ini menyebabkan kebanyakan epidemik besar di daerah sabuk meningitis, yaitu sekitar 80% hingga 85% kasus meningitis meningokokus yang didokumentasikan.