Tuberculosis is caused by bacteria that spread from infected person to healthy person via air. This happens when the infected person sneezes, coughs, sings or talks. If left untreated, it can be fatal.
The bacteria can live in the body of the host without making him/her sick. The person may or may not feel any obvious symptoms of the condition. When the bacteria are actively multiplying in the body, symptoms can be visible and make the person severely ill.
Symptoms of pulmonary and extra-pulmonary tuberculosis vary because of the location of the infection. This is described in detail here:
In addition, other symptoms are present, such as:
Oxygenated organs of the body like kidneys, lungs, spines and bones are also affected by the condition. Symptoms may vary with the site of infection. For example:
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