Nocardia
| Nocardia | |
|---|---|
| Close-up image of a Nocardia species culture on sheep blood agar | |
| Scientific classification | |
| Domain: | Bacteria |
| Kingdom: | Bacillati |
| Phylum: | Actinomycetota |
| Class: | Actinomycetia |
| Order: | Mycobacteriales |
| Family: | Nocardiaceae |
| Genus: | Nocardia Trevisan 1889 (Approved Lists 1980) |
| Type species | |
| Nocardia asteroides (Eppinger 1891) Blanchard 1896 (Approved Lists 1980) | |
| Species | |
|
See text. | |
| Synonyms | |
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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. Some species are nonpathogenic, while others are responsible for nocardiosis. Nocardia species are found worldwide in soil rich in organic matter. In addition, they are oral microflora found in healthy human gingiva, as well as periodontal pockets. Most Nocardia infections are acquired by inhalation of the bacteria or through traumatic introduction through openings in epithelial barriers.