Home

Actinomycosis bacteria

Actinomycosis: etiology, clinical features, diagnosis

Actinomycosis: MedlinePlus Medical Encyclopedi

Actinomycosis - Infectious Diseases - Merck Manuals

Skin inflammatory (nontumor) - Actinomycosis. Predisposing factors include poor oral hygiene, trauma, male gender, diabetes mellitus, immunosuppression, alcoholism and malnutrition (Infect Drug Resist 2014;7:183) The filamentous bacteria are a normal commensal inhabitant of the oral and buccal cavities, gastrointestinal tract and female genitali Actinomyces spp and Propionibacterium propionicus (previously Arachnia propionica) are members of a large group of pleomorphic Gram-positive bacteria, many of which fhave some tendency toward mycelial growth. Both are members of the oral flora of humans or animals. Actinomyces species, in particular, are major components of dental plaque. A israelii, A gerencseriae (previously A israelii.

Actinomyces is a genus of the Actinobacteria class, ubiquitous Gram-positive bacteria which include A. odontolyticus, A. oricola, A. radicidentis, A.c radingae, and A. slackii. Some, such as A. naeslundii, A. viscosus, and A. odontolyticus may be involved in the etiopathogenesis of dental caries and periodontal disease Actinomycosis V K Wong,1 T D Turmezei,2 V C Weston1 Actinomycosis is a rare, chronic, and slowly progressive granulomatous disease caused by filamentous Gram posiĀ­ tive anaerobic bacteria from the Actinomycetaceae family (genus Actinomyces).1 It is often misdiagnosed because it can mimic other conditions such as malignancy and tuberĀ Marc S. Levine MD, in Textbook of Gastrointestinal Radiology (Third Edition), 2008 ACTINOMYCOSIS. Actinomycosis is an indolent, suppurative infection caused by Actinomyces israelii, an anaerobic gram-positive bacterium.Rarely, this organism may cause severe esophagitis in patients with AIDS. 88 Esophageal actinomycosis may be manifested on esophagography by deep ulcers with multiple. Pulmonary actinomycosis is a rare bacterial lung infection. It's also known as thoracic actinomycosis Actinomycosis is an infection that can occur in dogs when microbes from the Actinomyces bacteria group penetrate the skin or body. The Actinomyces bacterium is naturally occurring in the mouth of dogs

Actinomycosis - Infections - Merck Manuals Consumer Versio

Actinomyces israelii has long been recognized as a causative agent of actinomycosis. During the past 3 decades, a large number of novel Actinomyces species have been described. Their detection and identification in clinical microbiology laboratories and recognition as pathogens in clinical settings can be challenging Actinomycosis is a rare subacute or chronic bacterial infection that causes both suppurative and granulomatous inflammation. Characteristics include localized swelling with suppuration, abscess formation, fibrosis and sinus drainage of pus containing 'sulfur granules'. Actinomycetes are normal colonizing organisms of the oral cavity and may. INTRODUCTION Management of actinomycosis often entails prolonged courses of antimicrobials. Surgical intervention may also be necessary in more complicated cases, such as infection in critical spaces (eg, epidural infections, brain abscesses), patients with massive hemoptysis, or when extensive abscesses and fistulous tracts are present

Overview of Actinomycosis - Generalized Conditions - Merck

Actinomycosis: Causes, Symptoms, and Diagnosi

Actinomycosis, chronic bacterial infection of humans and cattle that is caused by anaerobic or microaerophilic (oxygen-requiring) species of the genus Actinomyces Actinomycosis is a rare subacute to chronic infection caused by the gram-positive filamentous non-acid fast anaerobic to microaerophilic bacteria, Actinomyces. The infection is usually a granulomatous and suppurative infection. The chronic form has multiple abscesses that form sinus tracts and are associated with sulfur granules Actinomyces is a genus of bacteria that consists of a widely varied number of species that can exist both in the soil microbiome as well as within human and animal bodies. The Actinomyces genus mostly consists of Gram-positive bacilli that are facultatively anaerobic or microaerophilic rods

Actinomycosis by lazoithelife - Issuu

Actinomycosis - Wikipedi

  1. Pulmonary actinomycosis is caused by certain bacteria normally found in the mouth and gastrointestinal tract. The bacteria often do not cause harm. But poor dental hygiene and tooth abscess can increase your risk for lung infections caused by these bacteria. People with the following health problems also have a higher chance of developing the.
  2. Actinomyces bacteria normally live in the mouth and in the nasal passages near the throat. Several species are associated with diseases in dogs. Actinomyces bovis has been identified infrequently in infections in dogs and other mammals
  3. Actinomycosis is a rare type of bacterial infection. It can be very serious but can usually be cured with antibiotics
  4. Actinomyces are gram-positive, anaerobic bacteria that cause disease primarily in cattle and swine but also occasionally in other animals. Lumpy jaw is a localized, chronic, progressive, granulomatous abscess that most frequently involves the mandible, the maxillae, or other bony tissues in the head

Actinomycosis: Causes, types, symptoms, and diagnosi

  1. Actinomycosis. Actinomycosis is a long-term (chronic) bacterial infection that commonly affects the face and neck. Actinomycosis (lumpy jaw) is caused by a bacteria introduced to face tissues by trauma, surgery or infection. Long term treatment with antibiotics is often required. Bacterial infections can lead to the formation of pus, or to the.
  2. Actinomycosis is caused by anaerobic or microaerophilic, filamentous, gram-positive bacteria that belong to the genus Actinomyces (and to a lesser extent, the related genus Arcanobacterium). These organisms are normal inhabitants of mucous membranes, especially of the oropharynx, but also the genital and gastrointestinal tracts, and cause.
  3. Actinomyces and related gram-positive bacteria are common and may form part of the normal oral mucosal flora. The disease results from the penetration of these bacteria into deeper tissues. Pelvic actinomycosis is strongly associated with intrauterine devices. Actinomyces can be present in the distal gut and the genitals
  4. antly anaerobic bacteria. These organisms belong to the phylum, Actinobacteria, in the order Actinomycetales, and family, Actinomycetaceae

Actinomycosis is the most common infectious disease of kangaroos . In 1958, Batty isolated A. odontolyticus from persons with advanced dental caries. During the ensuing 40+ years, 23 patients with invasive infection caused by A. odontolyticus have been described in North America, Europe, and Asia (9-16) Actinomycetes are a group of aerobic and anaerobic bacteria in the order Actinomycetales. These organisms are phylogenetically diverse but morphologically similar, exhibiting characteristic filamentous branching structures which then fragment into bacillary or coccoid forms ().The name actinomycosis means ray fungus, and the organisms may resemble fungi owing to their filamentous appearance Actinomyces (microscopic) Gram-positive, beaded and branching rods (magnification 1125x) characteristic of actinomyces. Specimen from jaw area, often organisms may not grow in laboratory. Source: CDC/ Dr. Lucille Georg. Actinomyces is a sample topic from the Johns Hopkins ABX Guide Actinomyces are rod-shaped gram-positive bacteria that are part of the normal microbial flora of oropharynx, gastrointestinal and female genital tracts.Actinomyces tend to cause infections that are chronic and produce abscess, inflammation, and fibrosis. Most common sites of infection are in the face and neck region followed by lung. In the study in this issue by Farazmand et al, 1 the authors.

Cope, in 1938, classified actinomycosis infection into three distinct forms: cervicofacial (50%), pulmonothoracic (30%), and abdominopelvic (20%). Actinomycosis has been identified in numerous locations in the oral cavity and pharynx such as dental plaques, tonsillar crypts, carious dentin, gingival surface, and periodontal pockets Pelvic actinomycosis infection is a rare but serious infection caused by Actinomyces sp., an opportunistic gram-positive bacteria usually introduced by foreign bodies specially IUCDs, surgery, or trauma.It generally falls under the broader spectrum of pelvic inflammatory disease Pulmonary actinomycosis is a rare bacterial lung infection. It is also known as thoracic actinomycosis. It isn't contagious. This condition mainly affects people between 30 and 60. It occurs more. Pelvic actinomycosis comprises a rare, subacute to chronic bacterial infection characterised by suppurative and granulomatous inflammation. The disease is caused by bacteria of Actinomyces species. In healthy subjects, Actinomyces is a part of normal flora of the oral cavity, gastrointestinal tract, and the genital tract

Monomicrobial infections. Preferred regimens ā€” We generally suggest high-dose penicillin for actinomycosis [ 1-3 ]. Reasonable alternatives include ceftriaxone and amoxicillin. The route of administration depends on the severity of infection Digestive tract Actinomycosis. Actinomyces israelii is the most common bacteria invading the abdominal region. Places of occurrence- Appendix, cecum, and colon are the most common places of bacterial invasion in the abdomen.Some rare cases have been reported in the liver and the pancreas too

Summary. Actinomycosis is an infection caused by Actinomyces bacteria (especially Actinomyces israelii), which is ubiquitous in the oral cavity and is sometimes found in the gut or female genital tract. Actinomyces thrives in anaerobic environments, which are created by the proliferation of oxygen-consuming aerobic bacteria.The most frequent form of infection is cervicofacial actinomycosis. Considering taking medication to treat an+infection+by+actinomyces+bacteria+called+actinomycosis? Below is a list of common medications used to treat or reduce the symptoms of an+infection+by. Thoracic actinomycosis refers to an uncommon indolent infection caused principally by the genus Actinomyces (higher prokaryotic bacteria belonging to the family Actinomyceataceae). Epidemiology While it is rare in general, the thoracic form act..

IUDs and colonization or infection with Actinomyce

Actinomycosis is an anaerobic, Gram-positive bacterial infection, seen in different regions of the body. Actinomycosis is caused in man by Actinomyces israelii and in animals by Actinomyces bovis. Also, human infections due to A. bovis, A. naeslandii, and A. viscosus have been documented. The infection is commonly seen in tropical countries and. Actinomycosis is a subacute-to-chronic bacterial infection caused by filamentous, gram-positive, anaerobic-to-microaerophilic bacteria that are not acid fast. It is characterized by contiguous spread, suppurative and granulomatous inflammatory reaction, and formation of multiple abscesses and sinus tracts that discharge sulphur granules Actinomycosis is a granulomatous infection of the cervicofacial, thoracic, abdominal, and pelvic regions. The traditional treatment is high-dose penicillin for a prolonged period (6 months to 1 year). These recommendations evolved at a time when patients who had actinomycosis usually presented late with large lesions (bulky disease) and were.

Actinomyces - Wikipedi

actinomycosis: Definition Actinomycosis is an infection primarily caused by the bacterium Actinomyces israelii . Infection most often occurs in the face and neck region and is characterized by the presence of a slowly enlarging, hard, red lump. Description Actinomycosis is a relatively rare infection occurring in one out of 300,000(1/300,000). Actinomycosis in Cats. This infectious disease is caused by a gram positive, pleomorphic (can change shape somewhat between a rod and coccus), rod-shaped bacteria of the genus Actinomyces, most commonly the A. viscosus species. Able to survive with little (microaerophilic) or no oxygen (anaerobic), Actinomyces is rarely found as the single bacterial agent in a lesion Assignment of human-derived CDC group 1 coryneform bacteria and CDC group 1-like coryneform bacteria to the genus Actinomyces as Actinomyces neuii subsp. neuii sp. nov., subsp. nov., and Actinomyces neuii subsp. anitratus subsp. nov. Int. J. Syst. Bacteriol.44:167-171

Actinomycosis: Background, Pathophysiology, Epidemiolog

Caused by Actinomyces bacteria, actinomycosis is a bacterial disease that impacts the mouth and alimentary tract of your horse and can lead to his experiencing partial starvation. Actinomycosis Average Cost. From 263 quotes ranging from $650 - $3,000. Average Cost. $1,000 Actinomyces, one of the types of bacteria in the order Actinomycetales, is the focus of this article. Actinomyces bacteria cause actinomycosis, an infectious disease that can occur throughout the body. Actinomycosis is most commonly due to the species Actinomyces israelii, which causes infections that typically affect the face and neck but can. Actinomycotic infection is uncommon and primary actinomycosis of the lung and chest wall has been less frequently reported. This disease may present as chronic debilitating illness with radiographic manifestation simulating lung tumor, pulmonary infiltrating lesion, or chronic suppuration. From 1984 to 1990, we experienced 17 cases of thoracic actinomycosis Actinomycosis is an infection with Actinomyces species. The craniocervical localization, arising from the oral cavity, is well known. Apart from this, there are thoracic, abdominal and genital manifestations. The overall incidence of registered cases of actinomycosis is decreasing. Abdominal and genital actinomycosis, however, are increasing in. Actinomycosis is a rare and chronic infection, caused predominantly by the bacterium Actinomyces israelii and to a lesser extent by other Actinomyces species. The topic Actinomyces Infection you are seeking is a synonym, or alternative name, or is closely related to the medical condition Actinomycosis

Introduction. Actinomycosis is an infrequent invasive bacterial disease that has been recognized for over a century. Actinomyces spp. are filamentous Gram-positive bacilli, mainly belonging to the human commensal flora of the oropharynx, gastrointestinal tract, and urogenital tract. To date, multiple different clinical features of actinomycosis have been described, as various anatomical sites. Actinomycosis of the brain and meninges in dogs can also occur, although it is uncommon. 6,43,43 Clinical findings associated with brain infections are nonlocalizing and include altered behavior, decreased consciousness, cervical pain, vision loss, ataxia, tetraparesis, abnormal reflexes, and seizures. The results of magnetic resonance imaging may reveal meningeal thickening, contrast.

Ontology: Actinomycosis (C0001261) Definition (NCI) An infectious process caused by bacteria of the Actinomyces species. It is characterized by the formation of purulent and painful abscesses in the mouth, lungs and gastrointestinal tract. Definition (MSH) Infections with bacteria of the genus ACTINOMYCES. Concepts Actinomycosis is an infection primarily caused by the bacterium Actinomyces israelii. Infection most often occurs in the face and neck region and is characterized by the presence of a slowly enlarging, hard, red lump. Description. Actinomycosis is a relatively rare infection occurring in one out of 300,000(1/300,000) people per year Bacterial Infection (Actinomycosis) Average Cost. From 62 quotes ranging from $250 - $2,00

Pathology Outlines - Actinomycosi

Actinomyces are gram-positive, facultative anaerobic bacilli and are normal commensals of the oral, gut, vagina, and skin flora .In the majority of cases, the infection with these organisms goes unnoticed .This is mostly due to the natural immunity of the body as well as the organism being susceptible to commonly available antibiotics .Bacteremia with these organisms is rare Actinomyces israelii, or just A. israelii, is a gram-positive rod-shaped bacteria that causes a human infection called actinomycosis.. Calling this bug actinomyces implies that it's morphologically similar to fungus, because both form microscopic branching filaments (or mycelium), while the word Israelii comes from James Adolf Israel, the German surgeon who first described it Actinomycosis is a chronic bacterial infection caused by Actinomyces, Gram-positive anaerobic bacteria. Its symptomatology imitates some malignant pelvic tumours, tuberculosis, or nocardiosis, causing abscesses and fistulas. Actinomycoses are opportunistic infections and require normal mucous barriers to be altered

What is Actinomycosis? Actinomycosis is a chronic, rare bacterial infection mostly affecting the face and neck. It can sometimes occur in the chest, abdomen, pelvis and other areas too Actinomycetes are non-motile filamentous gram positive bacteria belonging to the genus of the Actinobacteria class of bacteria. Fungi are a group of microorganism which includes single cell and complex multicellular organisms such as yeast, mushrooms, moulds, etc. Cellular Organization: Actinomycetes are prokaryotic organisms Actinomyces israelii is a species of bacteria that is commonly found in the human body, usually in the nose and mouth. Under normal circumstances, it is harmless to humans. Under normal. Actinomycetes, the good bacteria, are gram-positive, anaerobic bacteria that colonize in your dog's oral and nasopharyngeal mucous membranes. One of its genera, actinomyces, can cause a bacterial infection known as actinomycosis. An opportunistic bacteria, it is introduced via specific factors Actinomycosis is a chronic bacterial infection caused by certain species of the genus Actinomyces such as A. naeslundii, A. viscosus and A. odontolyticus. The most common clinical form of actinomycosis is cervicofacial, but thoracic and abdominal actinomycosis, as well as pelvic actinomycosis in women, are also possible

Actinomycosis in animals - WikipediaAnaerobic Identification 1 at University of Texas

Actinomycosis is an infection caused by the bacterium Actinomyces. The infection begins when the bacteria, which are normal inhabitants of the mouth and intestine, are introduced into injured tissues. Such infections commonly occur in the face and neck. Actinomycosis typically follows the extraction of a tooth ACTINOMYCOSIS. Actinomycosis is a chronic, suppurative granulomatous inflammation caused by Actinomyces israelli. Actinomyces israelli is a filamentous gram positive organism of genus Actinobacteria. It is a normal commensal in humans in the oral cavity, lower gastrointestinal tract and female genital tract. This disease occurs worldwide and is.

Actinomyces, Propionibacterium propionicus, and

  1. Actinomycosis is a chronic suppurative bacterial infection caused by Actinomyces species. Actinomyces israelii is the organism most commonly found in human disease. Actinomycosis usually manifests with abscess formation, dense fibrosis, and draining sinuses. The disease is further characterized by the tendency to extensively spread beyond.
  2. What is actinomyces infection. Actinomycosis is a rare chronic disease caused by Actinomyces spp., anaerobic filamentous Gram-positive bacteria that normally colonize the human mouth and digestive and genital tracts 1).Typical actinomycosis in humans is a chronic disease caused by Actinomyces israelii, Actinomyces gerencseriae and Propionibacterium propionicus (previously Arachnia propionica) 2)
  3. al actinomycosis, but some sources do not discri
  4. Actinomycosis is a sub-acute to chronic bacterial disease which is caused by the filamentous, anaerobic to microaerophilic, and gram positive bacteria that are non-acid fast. Actinomycosis Frequency Actinomycosis is a very rare infection in the United States
  5. Actinomycosis treatment involves the use of antibiotics. Sulfonamide allergies are more common than penicillin allergies, so they are considered a second-line actinomycosis treatment. Another medication, cephtriaxone, can be used when actinomycosis bacteria, or companion bacteria, are resistant to penicillin

Periapical actinomycosis is a nonresolving lesion associated with actinomycotic infection and has been suggested as a contributing factor in the perpetuation of periapical radiolucencies after root canal therapy. 5,19 Failure to establish asepsis during treatment is one of the major causes of such secondary infections In 14 lesions, >1 Actinomyces species (2 to 4) was identified. Among streptococci of the milleri group, Streptococcus anginosus and Streptococcus constellatus , were recovered from 18 and 12 lesions, respectively

Actinomyces are facultatively anaerobic (except A. meyeri, a strict anaerobe). Actinomyces colonies form fungus-like branched networks of hyphae. Actinomyces are known for causing disease in humans and are normally present in the gums and are the most common cause of infection in dental procedures and oral abscesses Background Infective endocarditis caused by Actinomyces spp. is extremely rare. However, cases by new species of Actinomyces have been increasingly reported due to advances in laboratory techniques, and many of these species do not cause classic presentations of actinomycosis. Actinomyces neuii is reported to have a tendency to cause endovascular infection. The course of infective endocarditis. Actinomycosis is a rare and chronic infection, caused predominantly by the bacterium. Cervicofacial Actinomycosis is the most common type of actinomycosis, occurring in over half of the reported cases. It involves the jaw, mouth, and neck, and is also known as Oral Cervicofacial Actinomycosis Actinomycosis is a chronic granulomatous condition that commonly manifests as cervicofacial, pulmonary, or abdominal disease, caused by slowly progressive infection with oral and gastrointestinal commensal Actinomyces species. Treatment of actinomycosis is usually simple in immunocompetent individuals, requiring long-term, high-dose intravenous. Actinomyces actually means ray fungus in Greek Actinomyces are true bacteria due to the lack of mitochondria and a nuclear membrane, reproduction by cell fission and susceptibility to penicillin but not to antifungal chemotherapeutic agents Actinomyces are morphologically similar to Nocardia except that they Actinomyces are not acid-fast

Actinomyces - an overview ScienceDirect Topic

  1. A rare, pyogenic, granulomatous, subacute to chronic infection caused by actinomycetes. Actinomycetes are a group of anaerobic gram-positive bacteria with high guanine-cytosine content found as natural flora of the oral cavity. The most frequent features are ulcer and granuloma formation, and the..
  2. Actinomycosis is a rare kind of bacterial infection which is caused by a group of bacteria named actinomyces. This bacteria attacks various regions such as mouth, colon and vagina. Their most common location is around the jaw and lungs. They slowly disrupt mucosa linings which can lead to infection
  3. Actinomycosis is a chronic, suppurative, granulomatous infectious disease, caused by different species of Actinomyces bacteria. To date, 26 validly published Actinomyces species have been described as part of a normal human microbiota or from human clinical specimens. Due to the rapid spread of new, modern diagnostic procedures, 13 of 26 of these species have been described in this century and.

Actinomycosis - an overview ScienceDirect Topic

Pulmonary Actinomycosis: Treatments and Mor

  1. Actinomycosis is a rare, chronic, and slowly progressive bacterial infection that induces suppurative and granulomatous inflammation characterized by swelling with suppuration, sinus tract formation, and purulent discharge containing yellowish sulfur granules [].Among six pathogenic species of Actinomyces spp., Actinomyces israelii is the most common human pathogen
  2. Mandibular actinomycosis (MA) is an uncommon disease caused by Actinomyces israelii. 1 Actinomycosis infection typically manifests as a chronic disease resulting in multiple abscesses, firm soft tissue masses, and the presence of sulfur granules in exudates or tissues. 2 When the infection involves bone, osteolysis is likely to occur. 3 In the maxillofacial region, infection is frequently of.
  3. antly anaerobic, nonā€motile, gramā€positive bacteria commonly found in human mucosae, particularly in the oral cavity and gastrointestinal and urogenital tracts 1. Actinomyces majerii, Actinomyces odontolyticus, and particularly Actinomyces israelii and Actinomyces graevenitzii 1 are the most prevalent pathogens associated with pulmonary infections

Understanding Bacterial Infection Actinomycosis in Dog

Rationale: Actinomycosis is a rare anaerobic, gram-positive bacterial infection caused by Actinomyces, which is part of the normal flora in the oral cavity and respiratory and female genitourinary tracts.The cervicofacial area is the most common site of involvement, and involvement of the central nervous system is rare Actinomycosis infection with involvement of the vertebral column and chest cavity is extremely rare and may resemble malignant tumours.1 It is probably under-recognised since its clinical presentation is often misleading and accurate bacteriological diagnosis is challenging.1 2 Actinomyces is believed to invade the lungs either after aspiration of oropharyngeal secretions containing the. Actinomyces spp. are higher prokaryotic bacteria belonging to the family Actinomyceataceae.When they were first described in the early 19th Century, they were misclassified as fungi 1.The name A. bovis was given to a ray-like organism found in purulent material obtained from cattle mandibles; the word actinomycosis was derived from the Greek terms aktino, which refers to the radiating. ACT : Anaerobic Actinomyces are nonsporeforming, thin branching, gram-positive bacilli that are part of the normal flora of the human oral cavity and may also colonize the gastrointestinal and female genital tracts. Their presence is important in preserving the usual bacterial populations of the mouth and in preventing infection with pathogenic bacteria

Supragingival Microbes | Pocket Dentistry

Actinomyces and Related Organisms in Human Infections

Actinomycosis is a chronic infection caused mainly by the bacteria Actinomyces israelii.These are anaerobic bacteria, meaning they can thrive without oxygen. Actinomyces israelii are normally found on tooth enamel, gums, tonsils, and membranes lining the intestines and vagina. Under which of the following conditions does an actinomycosis infection typically develop Actinomycosis is a chronic infection, commonly of the face and neck, that produces abscesses and open draining sinuses. Drugs used to treat Actinomycosis The following list of medications are in some way related to, or used in the treatment of this condition

Actinomycosis Definition Actinomycosis is an infection primarily caused by the bacterium Actinomyces israelii. Infection most often occurs in the face and neck region and is characterized by the presence of a slowly enlarging, hard, red lump. Description Actinomycosis is a relatively rare infection occurring in one out of 300,000(1/300,000) people per. THE GENUS ACTINOMYCES. Members of the genus Actinomyces are grampositive, non-acid-fast, non-spore-forming rods. They are facultatively anaerobic, and most species prefer a reduced oxygen environment; CO 2 enhances the growth of aerotolerant species. Actinomyces spp. grow poorly, if at all, on Sabouraud's dextrose agar, a characteristic that differentiates them from Nocardia and. Actinomyces is a genus of actinomycetes. They are gram-positive bacteria and form branching filaments about 0.5 Ī¼m in width. Actinomyces are ubiquitous bacteria present everywhere, including soil and animal and human microbiota. Moreover, most of them are facultative anaerobes, while few species such as A. meyeri and A. israelii are obligate. Actinomyces graevenitzii is a newly recognized Actinomyces species that is seldom isolated from clinical specimens. This organism is an opportunistic human pathogen. It is possible a component of the oral pharyngeal flora. Isolated from human clinical specimens, mainly respiratory tract secretions ACTINOMYCOSIS 1. DR AMITHA G, BDS, MDS ORAL AND MAXILLOFACIAL PATHOLOGY Actinomyces species are classified as anaerobic, gram positive and filamentous bacteria. It is a chronic granulomatous suppurative and fibrosing disease caused by anaerobic or microaerophilic gram-positive nonacid fast, branched filamentous bacteria. Most of the species isolated from actinomycotic lesions have been.