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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 ...
The Nocardiaceae form a monophyletic clade within the Corynebacteriales in both 16S rRNA and protein-based phylogenetic trees. [7] [8] A number of conserved signature indels and conserved signature proteins have been identified which are uniquely found in the genera Nocardia and Rhodococcus, supporting a close relationship between the two genera. [8]
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.
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Actinomyces is a genus of the Actinomycetia class of bacteria. They all are Gram-positive and facultatively anaerobic , growing best under anaerobic conditions. [ 2 ] Actinomyces species may form endospores , and while individual bacteria are rod-shaped , Actinomyces colonies form fungus -like branched networks of hyphae . [ 3 ]