Neisseria

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Neisseria
Fluorescent antibody stain of Neisseria gonorrhoeae.
Fluorescent antibody stain of Neisseria gonorrhoeae.
Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Beta Proteobacteria
Order: Neisseriales
Family: Neisseriaceae
Genus: Neisseria
Trevisan, 1885

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Neisseria is a genus of bacteria included among the proteobacteria, a large group of Gram-negative forms. Neisseria are diplococci that resemble coffee beans when viewed microscopically.[1] The genus includes the species N. gonorrhoeae (also called the gonococcus), which causes gonorrhoea, and N. meningitidis (also called the meningococcus), one of the most common causes of bacterial meningitis and the causative agent of meningococcal septicaemia.

This genus also contains several, believed to be nonpathogenic species, like:

History

The genus Neisseria is named after the German bacteriologist Albert Neisser, who discovered its first example, Neisseria gonorrheae, the pathogen which causes the human disease gonorrhea. Neisser also co-discovered the pathogen that causes leprosy, Mycobacterium leprae. These discoveries were made possible by the development of new staining techniques which he helped to develop.

Biochemical Indentification

All the medically significant species of Neisseria are positive for both catalase and oxidase. Different Neisseria species can be identified by the sets of sugars from which they will produce acid. For example, N. gonorrheae makes acid from only glucose, however N. meningitidis produces acid from both glucose and maltose.

References

  1. Ryan KJ; Ray CG (editors) (2004). Sherris Medical Microbiology (4th ed. ed.). McGraw Hill. ISBN 0-8385-8529-9.

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