作者认为虽然化学预防结核病意见分岐,但美国仍广泛赞成化学预防,而一般不用BCG。化学预防主要用于OT(+)者。但在格陵兰及阿拉斯加的爱斯基摩人结核病流行特别高,即使OT(-)也采用化学预防。美国胸科协会对下列情况建议化学预防: 1.OT(+)X线无活动灶,既往未曾化疗者。 2.新发病(排菌)的家属及密切接触 The author believes that despite the divergent views on chemical prevention of tuberculosis, the United States is still generally in favor of chemical prevention, and generally do not have BCG. Chemical prevention is mainly used for OT (+). However, Eskimos in Greenland and Alaska have a particularly high prevalence of TB, even though OT (-) is also chemopreventive. The American Thoracic Society suggests chemoprophylaxis for the following conditions: 1. There is no active focus on the OT (+) X-ray and there is no previous chemotherapy. 2. The new incidence (bacteria row) of the families and close contact