Tuberculosis is a disease caused by "Koch's bacillus" or BK virus, which untreated patients transmit and spread through the air. The parts where the disease can appear in many forms: in the chest, in the lungs or externally, on the skin, in the bones, in the lymph nodes. Symptoms: 2 weeks of cough, fever, night sweats, loss of appetite, dizziness, fatigue, chest pain, bloody mucus. The duration of the treatment which is free is about six months.