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Approximately 5 days old Nocardia species on a CNA plate
Scientific classification Edit this classification
Domain: Bacteria
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)

See text.

  • Micropolyspora Lechevalier et al. 1961 (Approved Lists 1980)
  • Asteroides Puntoni & Leonardi, 1935
  • Proactinomyces (K.Lehmann & Haag) H.L.Jensen, 1934[2]

Nocardia is a genus of bacteria with more than 100 species.[3] It is found worldwide in organic-matter-rich soil.[4]

Some species cause harm if eaten.[5]

Nocardia uses aerobic respiration to grow in a wide temperature range.[6]


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Most Nocardia strains have a virulence factor which damages hosts. Transmission of bacteria via inhalation or through open wounds may lead to Nocardia infection. People with weakened immune systems are more susceptible to Nocardia infections.[7]


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Nocardia infections are treated by sulfonamide antibiotics.[8] Antibiotic therapy and proper wound care are essential to patient recovery.


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  1. Euzéby JP, Parte AC. "Nocardia". List of Prokaryotic names with Standing in Nomenclature (LPSN). Retrieved June 25, 2022.
  2. "Nocardia Trevisan, 1889". www.gbif.org. Retrieved 24 August 2022.
  3. Santos, Rui Pedro; Almeida, Juliana; Almeida, Filipa Tavares; Duarte, Maria da Luz (2018-06-04). "Cutaneous nocardiosis by a new pathogenic species: Nocardia grenadensis". BMJ Case Reports: bcr–2018–225441. doi:10.1136/bcr-2018-225441. ISSN 1757-790X.
  4. Das, Ayan Kumar (2013). "The Incidence of Nocardiosis at Pulmonary and Extra – Pulmonary Sites". JOURNAL OF CLINICAL AND DIAGNOSTIC RESEARCH. doi:10.7860/JCDR/2013/5177.3152.
  5. Rawat, Deepa; Rajasurya, Venkat; Chakraborty, Rebanta K.; Sharma, Sandeep (2023), "Nocardiosis", StatPearls, Treasure Island (FL): StatPearls Publishing, PMID 30252331, retrieved 2023-06-24
  6. Sykes, Jane E. (2014-01-01), Sykes, Jane E. (ed.), "Chapter 43 - Nocardiosis", Canine and Feline Infectious Diseases, Saint Louis: W.B. Saunders, pp. 409–417, doi:10.1016/b978-1-4377-0795-3.00043-0, ISBN 978-1-4377-0795-3, retrieved 2023-07-23
  7. Lerner, P. I. (1996-06-01). "Nocardiosis". Clinical Infectious Diseases. 22 (6): 891–905. doi:10.1093/clinids/22.6.891. ISSN 1058-4838.
  8. Root, Heather; Daniels, Lindsay; Marx, Ashley; Bartelt, Luther A.; Lachiewicz, Anne M.; Duin, David (2023-06-24). "Sulfonamides without trimethoprim in the treatment of Nocardia infections: A case report and literature review". Transplant Infectious Disease. 23 (1). doi:10.1111/tid.13452. ISSN 1398-2273.