世界上每秒钟就有一人新感染结核杆菌。
Someone in the world is newly infected with TB bacilli every second.
一个人只需要吸入少量结核杆菌，就可染病。
A person needs only to inhale a small number of these to be infected.
二十多亿人(世界总人口的三分之一)感染了结核杆菌——引发肺结核(TB)的细菌。
More than two billion people, or a third of the world's total population, are infected with Mycobacterium tuberculosis, the bacteria that causes tuberculosis (TB).
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