What is the morphology of Neisseria meningitidis?
meningitidis are gram-negative, coffee-bean shaped diplococci that may occur intracellularly or extracellularly in PMN leukocytes. N. meningitidis is a fastidious organism, which grows best at 35-37°C with ~5% CO2 (or in a candle-jar).
What are the basic microbiological characteristics of Neisseria meningitidis?
CHARACTERISTICS: Neisseria meningitidis belongs to the family Neisseriaceae 2. It is a Gram-negative, non-spore forming, non-motile, encapsulated, and non acid-fast diplococci, which appears in kidney bean shape under the microscope 1 3.
How do you differentiate Neisseria gonorrhoeae and Neisseria meningitidis?
N. gonorrhoea is kidney shaped with apposing ends concave. N. meningitidis is semicircular diplococcus with flat apposing ends.
What kind of bacteria is Neisseria meningitidis?
Neisseria meningitidis, often referred to as meningococcus, is a Gram-negative bacterium that can cause meningitis and other forms of meningococcal disease such as meningococcemia, a life-threatening sepsis.
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.
Is Neisseria meningitidis capsulated?
Pathogenic Neisseria meningitidis isolates contain a polysaccharide capsule that is the main virulence determinant for this bacterium.
What is the morphology of Neisseria gonorrhoeae?
Morphology of Neisseria gonorrhoeae: Under the microscope, it appears as a gram-negative coccus which is present in pairs (diplococci) with the flattening of the adjacent sides. The diameter ranges from 0.6-1 μm. The diplococci have kidney/coffee bean shape.
Is Neisseria meningitidis viral or bacterial?
Bacteria called Neisseria meningitidis cause meningococcal disease. About 1 in 10 people have these bacteria in the back of their nose and throat without being ill. This is called being ‘a carrier’. Sometimes the bacteria invade the body and cause certain illnesses, which are known as meningococcal disease.
Is Neisseria motile or nonmotile?
Neisseria gonorrhoeae is an aerobic gram-negative, non-spore forming, non-motile, encapsulated, and non-acid-fast bacteria, which appear in kidney bean shape under the microscope.
What are the characteristics of Neisseria?
Neisseria spp. are a Gram-negative non-spore-forming diplococcus that has a flattened shape; its size ranges between 0.6–0.8 μm. They are oxidase-positive, non-acid-fast cocci or plump rods. They can reach a diameter of around 0.6–0.8 μm and sometimes up to 1.0 × 2.0–3.0 μm.
What is the virulence factor of Neisseria meningitidis?
The virulence (14) of N. meningitidis is influenced by multiple factors: capsule polysaccharide expression, expression of surface adhesive proteins (outer membrane proteins including pili, porins PorA and B, adhesion molecules Opa and Opc), iron sequestration mechanisms, and endotoxin (lipooligosaccharide, LOS).
Does Neisseria meningitidis have a cell wall?
Neisseria Meningitidis is a bacteria that is best known for its role in endemic bacterial meningitis. N. Meningitidis is described as a gram-negative diplococci. The fact that this bacteria is gram negative means that there is very little or no peptidoglycan in the cell wall.