Neisseria meningitidis is a gram-negative bacterial pathogen that specifically infects humans. It is a frequent asymptomatic colonizer of the human upper respiratory tract, and most adults are resistant to infection through acquired immunity. In susceptible individuals, it causes meningococcal meningitis and severe septicemia.
Neisseria meningitidis serogroup A [GN:nmanmwnmx] Neisseria meningitidis serogroup B [GN:nmenmhnmdnmmnmsnmqnmz] Neisseria meningitidis serogroup C [GN:nmcnmnnmt]
