<unk> , also simply known as meningococcus, is a gram-negative diplococcal bacterium best known for its role in meningitis. It only infects humans; there is no animal reservoir. It is the only form of bacterial meningitis known to cause epidemics.
Neisseria meningitidis
Streptococcus pneumoniae
Haemophilus influenzae
Rhodococcus equi
Streptococcus pyogenes
Listeria monocytogenes
Listeria
Vibrio vulnificus