Habitat and Morphology of Mycobacterium tuberculosis

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Last Updated on January 12, 2020 by Sagar Aryal

Habitat and Morphology of Mycobacterium tuberculosis


  1. Human is only the know reservoir.
  2. Usually found in the lungs but can also live in any part of the body.
  3. They may be obligate pathogen, facultative or opportunistic pathogens or free living.
  4. Usually infect the mono-nuclear phagocytes.
  5. Can also be infected by the consumption of unpasteurized milk.
  6. Can survive for weeks in dust, on carpets or clothes, for months in sputum.
  7. They are also found in soil and water.

Habitat and Morphology of Mycobacterium tuberculosis


  1. Straight or slightly curved thin rod shaped bacilli
  2. Non-sporing, non-motile, non-capsulated bacteria.
  3. Acid fast bacilli, neither gram +ve nor gram –ve.
  4. During acid fast stain, they appear bright red to intensive purple with green/blue background.
  5. They measure 0.5 µm x 3 µm.
  6. Appears in single, in pairs or small chumps.
  7. High content of mycolic acid (50 to 60 %).
  8. Cell wall is rich in lipids and waxes.
  9. They are wrapped together due to presence of fatty acids.
  10. Capable of intracellular growth.
  11. They are resistance to disinfectants, detergents, common antibiotics, dyes, stains, osmotic lysis, lethal oxidation, etc.

Habitat and Morphology of Mycobacterium tuberculosis

4 thoughts on “Habitat and Morphology of Mycobacterium tuberculosis”

  1. Hello Mr. Sagar Aryal

    I’m akasa from Indonesia. I’m public health lecturer. I would like to ask if there is a food that is good to prevent or is bad for growth of the TB bacteria.

    current study from micronutrients initiative reported that multiple mineral mixed with sunshine exposure did not give any advantage to children with TB. maybe you will kindly share something related to it

    • In Indian diet there are many foods which can stop division of Mycobacterium Tuberculosis, Some foods which can make it Dormant and Few foods which can kill it at any stage.

  2. Dear sagar
    I am very happy to see your blog and research interest. I am a lecturer in medical microbiology in one of higher education institution in Ethiopia. I am doing my Ph.D. proposal on molecular epidemiology of TB and multidrug resistance pattern. I am looking a person like you to give me input to my research and professional collaboration.
    with regards,


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