Fossil evidence indicates that TB has haunted humans for more than half a million years.No one is exempt.It affects rich and poor, young and old, risk takers and the abstinent.

• 化石证据显示，结核病已经纠缠人类超过50万年，它会侵袭富人与穷人、年轻人与老年人、冒险家与禁欲者，无一幸免。