title: Mycobacterium gilvum
text: # Mycobacterium gilvum
  
  Mycobacterium gilvum is a species of the phylum Actinomycetota (Gram-positive bacteria with high guanine and cytosine content, one of the dominant phyla of all bacteria), belonging to the genus Mycobacterium.
  
  Etymology: gilvum, Latin for pale yellow.
  
  ## Description
  
  Pleomorphic gram-positive, nonmotile and acid-fast rods.
  
  Colony characteristics
  
  * Pale yellow, Scotochromogenic, and smooth pleomorphic colonies.
  
  Physiology
  
  * Rapid growth on Löwenstein-Jensen medium at 25 °C and 37 °C, but not at 45 °C, within 7 days.
  * Resistant to isoniazid, rifampicin, and sodium aminosalicylate.
  
  Differential characteristics
  
  * 5 species-specific antigens, demonstrable in immunodiffusion tests.
  
  ## Pathogenesis
  
  * Not assumed to be pathogenic.
  * Biosafety level 1
  
  ## Type strain
  
  First isolated from sputum and pleura fluid (London). Strain ATCC 43909 = CCUG 37676 = CIP 106743 = DSM 44503 = JCM 6395 = NCTC 10742.
  
  