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Neisseria cinerea

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A gram-negative nonmotile diplococcus and non-spore forming bacterium associated with nosocomial human disease includes pneumonia, proctitis and endocarditis.


Neisseria cinerea grows at moist condition with an optimum growth at 37’C characterized as nonpathogenic diplococci present in the human nasopharynx. It is also isolated from conjunctiva of newborns treated prophylactically with erythromycin. In culture media this bacterium has been misidentified as Neisseria gonorrheae due to its similarity in appearance, size and consistency yet differs in diameter, opacity and degree of convexity.

Neisseria cinerea has been isolated from the human cervix and rectal infection that does not generate acid from maltose, glucose, fructose, sucrose and mannitol. Some strain of this bacterium will not react with antigonococcal protein I monoclonal antibodies. It is considered as glucose negative which produces weak acid reactions that quickly over oxidized to carbon dioxide and contains golden brown pigmentation.

Neisseria cinerea is implicated as a causative agent in nosocomial endocarditis, pneumonia, proctitis and pediatric ocular infections particularly to an immunocompromised individual, elderly and infants.

Scientific classification:

 Kingdom: Bacteria
 Phylum: Proteobacteria
 Class: Betaproteobacteria
 Order: Neisseriales
 Family: Neisseriaceae
 Genus: Neisseria
 Species: Neisseria cinerea

See also:

• Bacteria

• Nosocomial endocarditis

• Pneumonia