Difference between revisions of "Category:Mycobacterium species"

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[[Category:Bacterial Organisms]]

Revision as of 10:30, 24 August 2010


  • Mycobacterial infections are caused by bacteria belonging to the family Mycobacteriaceae, order Actinomycetales
  • Includes obligate pathogens, opportunistic pathogens and saprophytes
  • Cause chronic, progressive, granulomatous infections
  • Cause tuberculosis, Johne's disease and feline leprosy
  • M. bovis, M. tuberculosis and M. avium cause tuberculosis of cattle, tuberculosis of pigs and tuberculosis of dogs respectively
  • The 'classical' tuberculosis lesions are caused by the Mycobacterium tuberculosis complex
  • The Johne's type lesions are caused by the Mycobacterium avium complex
  • Environmental species are found in soil, vegetation and water
  • Mycobacterium leprae and M.lepraemurium cause human, feline/murine leprosy respectively
  • Atypical mycobacteriosis is a localized opportunistic skin and subcutaneous infection caused by saprophytic and rapidly growing atypical mycobacteria
  • Granulomatous lesions in muscle and skin
  • Skin tuberculosis of cattle causes nodules along the lymphatics of the limbs
  • Bovine farcy is thought to be caused by M. senegalense and M. farcinogenes
  • Saprophytic mycobacteria cause granulomatous lesions


  • Aerobic, weakly Gram-positive acid-fast rods
  • Non-motile, non-spore forming
  • Cell walls contain mycolic acid
  • Require egg-based media for growth
  • Slow-growing colonies
  • Resistant to disinfectants and environmental conditions; susceptible to pasteurisation
  • Mycobacteria stain with carbol dyes and resist subsequent decolorization with inorganic acids; this characteristic which is due to the spatial arrangement of mycolic acids within the cell wall makes them acid fast


  • Identified by Ziehl-Neelson staining
  • Differentiated by culture, biochemical tests, chromatography and molecular techniques
  • Pathogenic species require at least three weeks for growth on egg-based media

Pages in category "Mycobacterium species"

The following 4 pages are in this category, out of 4 total.