A genus of bacteria belonging to the family Neisseriaceae. They are gram-negative and usually occur in pairs with flattened sides but may occur singly or in irregular groups. The genus comprises 11 species. The two species most often associated with disease in man are Neisseria meningitis and Neisseria gonorrhoeae, which cause meningitis and gonorrhea respectively. Other Neisseria-species are relatively harmless parasites of the mucosa of the respiratory tract in man and animals.
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