Actinomyces

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Actinomyces

 [ak″tĭ-no-mi´sēz]
a genus of gram-negative, non–acid fast, nonmotile bacteria that form branched filaments. It includes A. israe´lii and A. naeslun´dii, both of which cause human actinomycosis and periodontal disease.

actinomyces

 [ak″tĭ-no-mi´sēz]
an organism of the genus Actinomyces. adj., adj actinomycet´ic.

Actinomyces

(ak'ti-nō-mī'sēz),
A genus of slow-growing, nonmotile, nonsporeforming, anaerobic to facultatively anaerobic bacteria (family Actinomycetaceae) containing gram-positive, irregularly staining filaments; diphtheroid cells may be predominant. They exhibit true branching while forming mycelial-type colonies. Most of the species produce a filamentous microcolony. The metabolism of these chemoheterotrophs is fermentative; the products of glucose fermentation include acetic, formic, lactic, and succinic acids but not propionic acid. Actinomyces may have characteristic sulfur granules in purulent drainage. These organisms are pathogenic for humans and other animals and can cause chronic suppurative infection in humans. More than 16 species have been described; type species is Actinomyces bovis.
[actino- + G. mykēs, fungus]

Actinomyces

/Ac·ti·no·my·ces/ (-mi´sēz) a genus of bacteria (family Actinomycetaceae).
Actinomyces israe´lii  a species parasitic in the mouth, proliferating in necrotic tissue; it is the etiologic agent of human actinomycosis and can cause actinomycotic mycetoma.
Actinomyces naeslun´dii  an anaerobic species that is a normal inhabitant of the oral cavity and a cause of human actinomycosis and periodontal disease.

Actinomyces

(ăk′tə-nō-mī′sēz′)
n.
A genus of rod-shaped or filamentous, gram-positive, anaerobic to facultatively anaerobic bacteria commonly found in the mammalian oral cavity, including certain species that are pathogenic, such as the causative agents of actinomycosis.

actinomyces

(ăk-tĭn′ō-mī′sēz, ăk′tə-nō-)
n. pl. actinomyces
Any of various rod-shaped or filamentous, chiefly anaerobic bacteria of the genus Actinomyces, commonly found in the mammalian oral cavity and including pathogenic species, such as the causative agents of actinomycosis.

Actinomyces

[ak′tinōmī′sēz] , pl. actinomycetes
Etymology: Gk, aktis, ray, mykes, fungus
a genus of anaerobic or facultative anaerobic, gram-positive bacteria. Species that may cause disease in humans, such as Actinomyces israelii (which causes actinomycosis), are normally present in the mouth and throat. Disease activity is normally limited to periodontal disease.

Actinomyces

A genus of slow-growing, facultatively anaerobic, nonmotile, nonspore-forming, gram-positive bacteria, which form branching, irregularly staining filaments, filamentous microcolonies, and metabolise by fermentation of certain sugars.

Actinomyces

Microbiology A genus of slow-growing, facultatively anaerobic, nonmotile, nonspore-forming, gram-positive bacteria, which form branching, irregularly staining filaments, filamentous microcolonies, and metabolize by fermentation of certain sugars. See Actinomycosis, Sulfur granules. Cf Bacteroides spp, Nocardiaspp.

Ac·ti·no·my·ces

(ak'ti-nō-mī'sēz)
A genus of slow-growing, nonmotile, non-spore-forming, anaerobic to facultatively anaerobic bacteria (family Actinomycetaceae) containing gram-positive, irregularly staining filaments. These organisms can cause chronic suppurative infection in humans. The type species is A. bovis.
[actino- + G. mykēs, fungus]

Ac·ti·no·my·ces

(ak'ti-nō-mī'sēz)
A genus of slow-growing, nonmotile, non-spore-forming, anaerobic to facultatively anaerobic bacteria containing gram-positive, irregularly staining filaments; diphtheroid cells may be predominant. Most species produce a filamentousmicrocolony. May have characteristic sulfur granules in purulent drainage. Pathogenic for humans and other animals and can cause chronic suppurative infection in humans.
[actino- + G. mykēs, fungus]

Actinomyces

a genus of non-acid-fast, gram-positive organisms that form a mycelium of branching filaments that fragment into irregular-sized fragments.

Actinomyces bovis
the cause of actinomycosis of cattle and sheep.
Actinomyces congolensis, Actinomyces dermatonomus
see dermatophiluscongolensis.
Actinomyces hordeovulneris
a cause of abscesses, pleuritis and systemic infections in dogs where it is often associated with penetration by grass awns (foxtails) of Hordeum spp.
Actinomyces israelii
an uncommon cause of actinomycosis in cattle and pigs.
Actinomyces necrophorus
see fusobacteriumnecrophorum.
Actinomyces pyogenes
now called Arcanobacterium pyogenes.
Actinomyces suis
the cause of actinomycosis of the swine mammary gland.
Actinomyces viscosus
the cause of periodontal disease in hamsters, and opportunistic infections of dogs.

actinomyces

an organism of the genus Actinomyces.