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Neisseria is a large genus of bacteria that colonize the mucosal surfaces of many animals. Of the 11 species that colonize humans, only two are pathogens , N. meningitidis and N. gonorrhoeae . Neisseria species are Gram-negative bacteria included among the Pseudomonadota , a large group of Gram-negative forms.
The commensal species of Neisseria can act as a reservoir of genes that can be acquired; for example, this is how capsule switching can occur as a means of hiding from the immune system. [17] An invasive N. meningitidis strain of serogroup C broke out in Nigeria in 2013 – the strain was a new sequence type, ST-10217 determined by multilocus ...
Neisseria gonorrhoeae, also known as gonococcus (singular) or gonococci (plural), is a species of Gram-negative diplococci bacteria first isolated by Albert Neisser in 1879. [3] An obligate human pathogen, it primarily colonizes the mucosal lining of the urogenital tract; however, it is also capable of adhering to the mucosa of the nose, [ 4 ...
The Neisseriaceae are a family [2] of Pseudomonadota, within the Neisseriales order of Betaproteobacteria.While many organisms in the family are mammalian commensals or part of the normal flora, the genus Neisseria includes two important human pathogens, specifically those responsible for gonorrhea (caused by N. gonorrhoeae) and many cases of meningitis ("meningococcal meningitis", caused by N ...
Neisseria cinerea is a commensal species grouped with the Gram-negative, oxidase-positive, and catalase-positive diplococci. [1] It was first classified as Micrococcus cinereus by Alexander von Lingelsheim in 1906.
Neisseria sicca is a commensal organism belonging to the genus Neisseria.It is Gram-negative and oxidase-positive. There are multiple strains of this species, some of which are reported to have caused septicaemia in immunocompromised patients.
Neisseria lactamica is a gram-negative diplococcus bacterium. It is strictly a commensal species of the nasopharynx . Uniquely among the Neisseria they are able to produce β-D-galactosidase and ferment lactose.
Gram stain of Neisseria gonorrhoeae showing characteristic diplococci morphology. Neisseria gonorrhoeae, the bacterium that causes the sexually transmitted infection gonorrhea, has developed antibiotic resistance to many antibiotics. The bacteria was first identified in 1879. [1]