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Another well publicized find is that of Nocardia as part of the oral microflora. Nocardia spp. have been reported in the normal gingivae and periodontal pockets along with other species such as Actinomyces, Arthromyces [clarification needed] and Streptomyces spp. [8] The usual mode of transmission is inhalation of organisms suspended in dust.
Nocardia as found on a brain biopsy. Nocardia is a genus of weakly staining Gram-positive, catalase-positive, rod-shaped bacteria. It forms partially acid-fast beaded branching filaments (appearing similar to fungi, but being truly bacteria). It contains a total of 85 species.
Nocardia brasiliensis is a species of Nocardia. As with most members of Actinomycetota, they contain high guanine and cytosine content. [1] It can cause nocardiosis. [2]
Actinomycosis is a rare infectious bacterial disease caused by the gram-positive Actinomyces species. [1] The name refers to ray-like appearance of the organisms in the granules. About 70% of infections are due to either Actinomyces israelii or A. gerencseriae. [1] Infection can also be caused by Streptomyces somaliensis and Propionibacterium ...
Most Actinomycetota of medical or economic significance are in class Actinomycetia, and belong to the order Actinomycetales.While many of these cause disease in humans, Streptomyces is notable as a source of antibiotics.
Actinomyces israelii is a species of Gram-positive, rod-shaped bacteria within the genus Actinomyces. Known to live commensally on and within humans, A. israelii is an opportunistic pathogen and a cause of actinomycosis. Many physiologically diverse strains of the species are known to exist, though not all are strict anaerobes. [2]
Actinomyces massiliensis is a non-spore forming, non-motile, Gram-positive, rod-shaped bacterium. [1] [2] Cells measure at 0.5-1.7 μm in length and 0.35-0.74 μm in width, and they appear as straight rods. [1] [2] When plated on sheep-blood agar, colonies of A. massiliensis are circular, white, and have a glossy sheen. [1]
Gordonia is a genus of gram-positive, aerobic, catalase-positive bacterium in the Actinomycetota, [1] closely related to the Rhodococcus, Mycobacterium, Skermania, and Nocardia genera. [2] Gordonia bacteria are aerobic, non-motile, and non-sporulating. [2] Gordonia is from the same lineage that includes Mycobacterium tuberculosis. [2]