Gram Negative Cocci

Neisseria gonorrhoeae, Neisseria meningitides, Moraxella catarrhalis, and other Neisseria spp. are clinically relevant gram-negative cocci.

N. gonorrhoeae is the leading cause of sexually transmitted disease whereas N. meningitides is a leading cause of fatal bacterial meningitis.

Moraxella catarrhalis: Properties, Lab Diagnosis

Moraxella catarrhalis: Properties, Lab Diagnosis

Moraxella catarrhalis is a small gram-negative diplococci that resembles Neisseria and causes otitis media in children.

Neisseria meningitidis: Properties, Pathogenesis, Lab Diagnosis

Neisseria meningitidis: Properties, Pathogenesis, Lab Diagnosis

Meningococci are capsulated gram-negative diplococci. Commensal of nasopharyx they may cause meningitis in susceptible persons.

Neisseria gonorrhoeae (gonococcus) Virulence Factors

Neisseria gonorrhoeae (gonococcus) Virulence Factors

Pili, outer membrane proteins, IgA1 protease and lipo-oligosaccharide (LOS) are important virulence factors of Neisseria gonorrhoeae.

Modified Thayer-Martin Agar: Preparation, Uses

Modified Thayer-Martin Agar: Preparation, Uses

Thayer-Martin agar is a selective medium used for the isolation of Neisseria gonorrheae from specimens containing a mixed flora of bacteria.

Gram-Negative Cocci and Coccobacilli of Medical Significance

Gram-Negative Cocci and Coccobacilli of Medical Significance

Gram-negative cocci of medical importance belong to the family Neisseriaceae which includes the genera Neisseria, Moraxella, Kingella, Acinetobacter.

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Neisseria gonorrhoeae vs. Neisseria meningitidis

Neisseria meningitidis is capsulated and ferment maltose (MM), whereas Neisseria gonorrhoeae is non-capsulated and do not ferment maltose.

Neisseria gonorrhoeae: Disease, Pathogenesis, Lab Diagnosis

Neisseria gonorrhoeae: Disease, Pathogenesis, Lab Diagnosis

Neisseria gonorrhoeae is a gram-negative kidney-shaped diplococci. It causes gonorrhea, a sexually transmissted infection.

Neisseria meningitidis Virulence Factors

Neisseria meningitidis Virulence Factors

Major virulence factors of Neisseria meningitidis are capsular polysaccharide, outer membrane proteins, endotoxin and IgA protease.

Size, Shape, Arrangement of Bacteria

Size, Shape, Arrangement of Bacteria

Bacteria exist in four basic morphologies: cocci; rod-shaped cells, or bacilli; spiral-shaped cells, or spirilla; and comma-shaped cells, or vibrios.