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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.
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.
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 ...
Actinomyces species may form endospores, and while individual bacteria are rod-shaped, Actinomyces colonies form fungus-like branched networks of hyphae. [3] The aspect of these colonies initially led to the incorrect assumption that the organism was a fungus and to the name Actinomyces, "ray fungus" (from Greek actis, ray or beam, and mykes ...
Certain Actinobacteria (especially aerobic ones in the order Mycobacteriales) with mycolic acid in their cell wall; not to be confused with Actinomyces, which is a non-acid-fast genus of actinomycete. Note that Streptomyces do not contain mycolic acid. Nocardia (weakly acid-fast; resists decolorization with weaker acid concentrations ...
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.
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]