This is because they are acid-fast (they have kept the dye even after being washed with acid and alcohol). TB is a bacterial disease caused by Mycobacterium tuberculosis occasionally by Mycobacterium bovis These organisms are also known as tubercle bacilli (because they cause lesion called tubercles) or as acid-fast bacilli (AFB). Extra-pulmonary TB (EPTB): accounts for 20% of all TB cases.Smear-negative PTB: 20-25% of all PTB cases.Smear-positive PTB: 75-80% of all PTB cases.Pulmonary TB (PTB): accounts for 80% of all TB cases.Thus it is conveniently classified into:.It usually affects the lungs but almost all organs can be affected. Tuberculosis is a Chronic necrotizing disease caused by Mycobacterium tuberculosis complex.
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