Although over two billion people — approximately a third of the world’s population — carry TB bacteria, when first infected these people have only a 10 - percent lifetime chance of actually contracting the disease.
उस व्यक्‍ति को TB किटाणुओं से संक्रमित होने पर हर साल में TB की बीमारी लगने का खतरा करीब ८ - प्रतिशत है ।