根据患者临床表现，痰菌、血液化验、结核菌素试验、影像学检查等判断结核病活动性；根据患者排菌量、病变与症状、排出飞沫大小、不同接触程度、环境因素等判断结核病传染性；尽快分离或隔离有传染性的患者，切断传播途径、保护易感人群等是结核病防控的基本要求。

The judgment of tuberculosis (TB) activity is based on clinical manifestation, sputum bacteria, blood test, tuberculin skin test and imaging examination, and the judgment of communicable TB is based on quantity of discharged bacteria, lesion and symptom, size of discharge droplets, level of contact with the patients
and environmental factors. Isolating contagious patients as soon as possible, cutting off transmission routes and protecting susceptible population are the basic requirements in controlling TB.