II. Pathophysiology

  1. Gram Positive, aerobic, nonmotile rods
  2. Previously categorized in the genus Corynebacterium
  3. Natural sources
    1. Soil
    2. Manure
    3. Animal hosts (Cattle, Sheep, Deer, Bears, Dogs, Cats)
  4. Immunocompromised patients (acquired via inhalation)
    1. HIV Infection (see Pulmonary Manifestations of HIV)
    2. Organ transplant recipients

III. Findings

  1. Necrotizing Pneumonia
    1. Upper lung lobe Nodules, infiltrates
    2. Upper lung lobe cavitary lesions with air fluid levels (distinguishes from Tuberculosis)
    3. Pleural Effusion

V. Resources

  1. Rhodococcus equi (Stat Pearls)
    1. https://www.ncbi.nlm.nih.gov/books/NBK441978/

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Ontology: Rhodococcus equi (C0010152)

Definition (NCI) A species of aerobic, Gram positive, rod and cocci shaped bacteria assigned to the phylum Actinobacteria. This species has a pink color, is urease positive and grows on glycerol. R. equi is a lung pathogen that can infect grazing animals and immunocompromised people.
Definition (NCI_CDISC) Any bacterial organism that can be assigned to the species Rhodococcus equi.
Definition (MSH) A species of RHODOCOCCUS found in soil, herbivore dung, and in the intestinal tract of cows, horses, sheep, and pigs. It causes bronchopneumonia in foals and can be responsible for infection in humans compromised by immunosuppressive drug therapy, lymphoma, or AIDS.
Concepts Bacterium (T007)
MSH D016929
SnomedCT 451041009, 80771008, 54276004
English Corynebacterium equi, CORYNEBACT EQUI, Nocardia restricta (Turfitt 1944) McClung 1974 (Approved Lists 1980), Rhodococcus equi (Magnusson 1923) Goodfellow and Alderson 1977, Corynebacterium equi Magnusson 1923 (Approved Lists 1980), Rhodococcus equi (Magnusson 1923) Goodfellow and Alderson 1979 (sic), Corynebacterium hoagii (Morse 1912) Eberson 1918, Bacillus hoagii, Corynebacterium (pyogenes) equi roseum, Corynebacterium magnusson-holth, Corynebacterium purulentus, Corynebacterium pyogenes (equi), Prescottia equi, Mycobacterium equi, Mycobacterium restrictum, Nocardia restricta, Proactinomyces restrictus, Corynebacterium equi (organism), RHODOCOCCUS EQUI, CORYNEBACTERIUM EQUI, Corynebacterium hoagii, Corynebacterium hoagii (organism), Rhodococcus equi (organism), Rhodococcus equi
Swedish Rhodococcus equi
Czech Corynebacterium equi, Rhodococcus equi
Finnish Rhodococcus equi
Russian KORINOBAKTERII LOSHADEI, RHODOCOCCUS EQUI, CORYNEBACTERIUM EQUI, КОРИНОБАКТЕРИИ ЛОШАДЕЙ
Japanese ロドコッカス・エクイ, コリネバクテリウム・エクイ
Italian Corynebacterium equi, Rhodococcus equi
Polish Rhodococcus equi
Norwegian Rhodococcus equi, Corynebacterium equi
Spanish Corynebacterium equi (organismo), Corynebacterium equi, Corynebacterium hoagii (organismo), Rhodococcus equi (organismo), Rhodococcus equi, Corynebacterium hoagii
French Corynebacterium equi, Rhodococcus equi
German Corynebacterium equi, Rhodococcus equi
Dutch Corynebacterium equi, Rhodococcus equi
Portuguese Corynebacterium equi, Rhodococcus equi