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.
Last updated on June 21st, 2021Moraxella catarrhalis is a small gram-negative diplococcus that resembles the cocci of the genus Neisseria. The genus Moraxella is one of the several in the family Neisseriaceae; other medically important […]
Last updated on June 21st, 2021Neisseria meningitidis also referred to as meningococci are fastidious, aerobic Gram-negative diplococci with adjacent sides flattened (lens-shape/half-moon-shaped). Though it is a commensal of nasopharynx for immunocompetent individuals, it may cause […]
Last updated on May 20th, 2021Neisseria gonorrhoeae, the gonococcus, is a gram-negative diplococcus that causes the sexually transmitted disease, gonorrhea. Gonorrhea commonly manifests as cervicitis, urethritis, and conjunctivitis. Neisseria gonorrhoeae is an exclusive human pathogen […]
Last updated on June 17th, 2021Thayer-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) […]
Last updated on May 28th, 2021The most common gram-negative cocci of medical importance belong to the family Neisseriaceae which includes the genera Neisseria, Moraxella, Kingella, Acinetobacter etc. Gram Negative Cocci Neisseria species The genus Neisseria contains 12 […]
Last updated on June 11th, 2021Neisseria gonorrhoeae and Neisseria meningitides are Gram negative diplococci (kidney bean-shaped) with flattened sides. They are characteristically found inside polymorphonuclear leucocytes. They are non-sporing, non-motile and oxidase positive. They have […]
Last updated on May 30th, 2021Neisseria is the only pathogenic gram negative cocci (precisely diplococci). Two species of Neisseria causes disease in humans; Neisseria meningitidis and Neisseria gonorrhoeae. Human beings are only known hosts of […]
Last updated on May 20th, 2021Capsular polysaccharides Neisseria meningitidis strains are frequently encapsulated and 13 different capsular serogroups have been found so far. These capsular polysaccharides protect the meningococci from the action of phagocytic cells […]
Last updated on June 21st, 2021Bacterial cells have a wide variety of sizes, shapes, and arrangements. They are too small to see through the naked eye. The unit of measurement used for microorganisms is the […]
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