Neisseria meningitidis is the bacteria that is responsible for invasive meningococcal disease including meningitis (inflammation/infection of the meninges) and meningococcemia (bacteria in the blood). There are 12 serogroups of N. meningitidis of which 6 can cause epidemics. These are A, B, C, W, X and Y. This bacteria is transmitted person-to-person via respiratory droplets and throat secretions and asymptomatic carriage is also possible.
Neisseria meningitidis can occur globally and with high rates seen in the meningitis belt of Africa. For more information please consult the following:
WHO’s meningitis page: https://www.who.int/health-topics/meningitis#tab=tab_1
WHO meningitis disease commodity package: https://www.who.int/publications/m/item/meningitis