| Actinomyces odontolyticus | A species whose normal habitat is the human oral cavity; it has been isolated from deep dental caries. (05 Mar 2000) |
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| actinomyces | <microbiology> A genus of gram-positive, rod-shaped bacteria whose organisms are nonmotile. Filaments that may be present in certain species are either straight or wavy and may have swollen or clubbed heads. (12 Dec 1998) |
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| Actinomyces bovis | A species of bacteria causing actinomycosis in cattle; infection in humans is not established; it is the type species of its genus. (05 Mar 2000) |
| Actinomyces israelii | A species of bacteria causing human actinomycosis and, occasionally, infections in cattle. (05 Mar 2000) |
| Actinomyces naeslundii | A species whose natural habitat is the oral cavity; human infections have been reported, and it produces periodontal destruction in some species of animals. (05 Mar 2000) |
| Actinomyces pyogenes | <bacteria> A species of corynebacterium isolated from abscesses of warm-blooded animals. (12 Dec 1998) |
| actinomyces viscosus | <microbiology> A species of actinomyces found in the oral cavity of man and hamsters. It has been isolated from actinomycotic lesions in swine, cats, and dogs and has been identified as a causative agent of animal diseases. (12 Dec 1998) |