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Nocardia asteroides
Definition 1
A species of aerobic, Gram-positive, rod shaped bacteria assigned to the phylum Actinobacteria. This species is catalase and urease positive, acid-fast, hydrolyzes esculin but not casein, reduces nitrate, and characteristically produces a mycelium that fragments into bacillary and coccoid elements. N. asteroides is naturally found in soil, ans lake and marine sediment where it digests plant matter; but in humans it is an opportunistic pathogen and one of the causative agents of nocardiosis in immunocompromised individuals. (NCI Thesaurus)
Definition 2
Any bacterial organism that can be assigned to the species Nocardia asteroides. (NCI Thesaurus/CDISC)
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A genus of Gram-positive, catalase-positive, rod-shaped bacteria in the phylum Actinobacteria.
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No new lesions; less than 50% reduction but less than 25% increase in any existing lesion (exclude bone marrow evaluation).
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Used to specify that the taxonomy rank is unknown.
