Tb is spread from person to person through the air .

结核病是通过空气人与人之间传播的。

Also , fewer people are dying from tb .

此外，越来越少的人死于结核病。

Tb is the number-one infectious disease killer in the world .

结核病是全世界传染病中的头号杀手。

Multi-drug resistant tb is harder to treat and requires second-line drugs .

耐多药结核病治疗困难并且需要使用二线药物。

A young doctor with drug-resistant tb entered his office trembling .

一名患有耐药结核病的年轻医生颤巍巍地走进他的诊室。