Morphology: “Kidney bean” or “coffee bean” shaped cocci. Occurring singly, but more often in pairs with adjacent sides flattened.
What is the arrangement of Neisseria gonorrhoeae?
Neisseria gonorrhoeae, also known as gonococcus, is a species of Gram-negative coffee bean-shaped diplococci that typically appear in pairs with the opposing sides flattened. Bacteria are responsible for the sexually transmitted disease gonorrhea.
What is the morphology of Neisseria?
Structure. Neisseria species are Gram-negative cocci, 0.6 to 1.0 μm in diameter. The organisms are usually seen in pairs with the adjacent sides flattened. Pili, hairlike filamentous appendages extend several micrometers from the cell surface and have a role in adherence.
How do you identify Neisseria?
N. meningitidis can be identified using Kovac’s oxidase test and carbohydrate utilization. If the oxidase test is positive, carbohydrate utilization testing should be performed. If the carbohydrate utilization test indicates that the isolate may be N.
Is Neisseria sicca aerobic or anaerobic?
Neisseria are typically considered as aerobic organisms but have since been shown in both N. meningitidis and N.
Does Neisseria sicca ferment lactose?
Neisseria sicca They also utilize glucose, maltose, fructose and sucrose to produce acid and not lactose and mannose. They are oxidase and catalase positive and also reduce nitrites but not nitrates4.
What is the shape of Diplococci bacteria?
A diplococcus (plural diplococci) is a round bacterium (a coccus) that typically occurs in the form of two joined cells.
Is Thayer Martin Agar selective or differential?
Thayer-Martin agar is a selective medium used for the isolation of gonococci (Neisseria gonorrheae) from specimens containing a mixed flora of bacteria and/or fungi e.g. urogenital specimen. Modified Thayer-Martin (MTM) agar is a GC agar base containing vancomycin, colistin, nystatin, and trimethoprim lactate (VCNT).
What does Neisseria sicca cause?
Some cases this bacterium caused serious infections includes endocarditis, bacteremia, meningitis and septic arthritis as well as peritonitis. Neisseria sicca has the ability to degrade hydrogen peroxide in salivary sediment and dental plaques.
Is Neisseria sicca Gram positive or negative?
Neisseria sicca is a gram-negative diplococcus found as nor- mal human oral and upper respiratory tract flora; it is considered one of the commensal Neisseria species.
Where is Neisseria sicca found?
What is the arrangement of Neisseria meningitidis?
Neisseria meningitidis or meningococcus is a Gram-negative, oxidasepositive, aerobic, coccal bacterium that appears microscopically under diplococcal arrangement. Strains are serogrouped on the basis of their capsular polysaccharides. The meningococci are one of the main causes of meningococcal meningitis.
What is the scientific name for Neisseria sicca?
This species was also recognized by Elser and Huntoon (1909) and Gordon (1921). Because of the variability in acid production patterns observed in early studies, Wilson and Smith (1928) recommended that N. sicca be grouped with M. catarrhalis, N. subflava biovar flava, N. cinerea, and N. mucosa in the species Neisseria pharyngis.
Is neneisseria sicca a pathogen?
Neisseria sicca is a member of the family Neisseriaceae. It is a normal inhabitant of the nasopharynx and is rarely pathogenic. A search of the literature reveals only a single case of meningitis and septicemia due to this agent.
What is the arrangement of cells in Neisseria gonorrhoeae?
Arrangement Of Cells – Neisseria gonorrhoeae is arranged in singly or in pairs (diplococci), with the adjacent side Concave and they are usually present intracellularly when direct microscopic examination of the specimen from the lesions is carried out.
What are the characteristics of Neisseria spp?
Growth Characteristics. Neisseria spp. grow best aerobically in an atmosphere containing 5–10% carbon dioxide at a temperature of 89.6–98.6°F (32–37°C) and a pH of 7–7.5. Cell size ranges from 0.6 to 1.5 mm depending upon the species source of the isolate and the age of the culture. Neisseria spp. are fastidious.
