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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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]
Farlex Partner Medical Dictionary © Farlex 2012

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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

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.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

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]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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]
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
KEY WORDS: Actinomycosis; Actinomycosis/surgery; Aerobic actinomyces infection [Supplementary Concept]; Abdominal Neoplasms; Liver Abscess; Pyogenic; Abdominal wall mass.
Pulmonary Actinomyces graevenitzii infection presenting as organizing pneumonia diagnosed by PCR analysis.
nucleatum infections is based on susceptibility to [beta]-lactams/[beta]-lactamase-inhibitors and metronidazole whereas Actinomyces species are resistant to metronidazole.
The clinically isolated strains of Streptococcus mutans, Actinomyces viscosus, Lactobacillus acidophilus, Lactobacillus and Streptococcus sanguis were obtained from State Key Laboratory of Oral Diseases, Sichuan University.
Actinomyces species have been isolated from clinical specimens such as blood, wound, bone, abscess, bronchial wash, gallbladder fluid, pleural fluid and urine (1).
"Actinomyces ihumii," a new bacterial species isolated from the digestive microbiota of a HIV-infected patient.
Comparison of histopathological findings in children and adults Pediatric Adult patients patients Specimen Case n % n % Adenoidectomy RLH 448 100 45 100 Tonsillectomy RLH 633 56.4 118 52 and/or adenoidectomy RLH and CT 468 41.5 84 36 Lymphangiomatous 1 0.09 - - polyp Squamous papilloma - - 4 1.9 Hemangioma 1 0.09 - - Epidermal inclusion cyst 4 0.3 2 0.9 B-cell non-Hodgkin's - - 1 0.45 lymphoma (Mantle) Diffuse large B-cell - - 1 0.45 lymphoma Actinomyces 19 16 20 8.6 Total Specimen n % Adenoidectomy 493 100 Tonsillectomy 751 55 and/or adenoidectomy 552 41 1 0.08 4 0.3 1 0.08 6 0.45 1 0.08 1 0.08 36 2.6 1849 100 RLH: reactive lymphoid hyperplasia; CT: chronic tonsillitis
A large diversity of microbial colonies with a predominance of black-pigmented bacteria can be found in acute periapical abscesses (extraradicular infections) (Figure 2, E-F), whereas endodontic treatment failures may be due to the presence of extraradicular apical biofilms, on which microorganisms such as Actinomyces israelii may be present (Figure 2, GH).
Jost, "Isolation of Arcanobacterium (Actinomyces) pyogenes from cases of feline otitis externa and canine cystitis," Journal of Veterinary Diagnostic Investigation, vol.
The most common species responsible for infections is Actinomyces israelii [2].