Infectious Diseases

Tuberculosis (TB) - Types, Investigations, and Treatment

Written by Dr. Vasantha K S and medically reviewed by iCliniq medical review team.

Image: Tuberculosis (TB) - Types, Investigations, and Treatment

Tuberculosis is an infectious disease caused by a bacterium named Mycobacterium tuberculosis. It most commonly affects the lungs but can also affect other organs in the body.


(i) Pulmonary - lungs.

(ii) Extrapulmonary - skin, pleura, central nervous system, lymphatic system, genitourinary system, bones, and joints.


They are primarily classified as latent or active.

Latent TB: The bacteria stay in the body in an inactive state and cause no ongoing symptoms but can get reactivated at a later stage causing active symptoms.

Active TB: The bacteria are active causing symptoms and at this stage, can be contagious (spread to other people).

How does it spread?

It spreads through the air. When a person with active TB infection, coughs, sneezes, talks or spits, the infected droplets containing the bacteria enter into the air and can get into a healthy person and infect them when they breathe the same air.

Although this sounds scary, it does not spread so easily to all, it takes some time and repeated exposure. For example, someone living in the same house or working at the same office as an infected person is at higher risk.


Symptoms may vary:

  • Fever
  • Night sweat.
  • Cough.
  • Blood-stained phlegm.
  • Pain when coughing.
  • Pain on breathing.
  • Fatigue.
  • Chest pain.
  • Loss of appetite.


Some people are at more risk of getting infected than others:

  • Diabetes.
  • Kidney illness.
  • Certain cancers.
  • Malnutrition.
  • Immunocompromised states such as HIV.
  • Family and friends of a person with TB.
  • Traveling to endemic areas.
  • Chemotherapy.

Prevention of spread

If you have an active TB infection, be sure to wear a special mask until treatment completion to prevent spread to near and dear ones.

Keep away from school or work to minimize exposure to others around you.


Apart from the initial skin test (Mantoux test), the more accurate tests to diagnose TB are:

- Blood tests.

- Chest X-ray.

- Sputum tests.

- CT scan, lung biopsy, and bronchoscopy may be ordered if other tests are inconclusive.


Special antibiotics are needed to treat TB. The regimen includes three or more drugs in a combination depending on your age, symptoms, and general health.

  • Isoniazid (INH).
  • Rifampin (RIF).
  • Rifapentine (RPT).
  • Ethambutol.
  • Pyrazinamide.

These drugs have to be taken on a long schedule of four to six months or more as these bacteria are quite resistant and not easy to clear off from the body.

It is important to complete the entire duration of the course as prescribed by your doctor. Many patients discontinue the treatment halfway when they have no more symptoms. But the bacteria would not have been completely eliminated and discontinuation can cause reactivation and relapse.

If you notice TB symptoms, consult a healthcare professional at the earliest.

For more information consult a tuberculosis specialist online -->

Last reviewed at: 07.Sep.2018



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