Cdc recommends tb testing for all passengers on the inoled flights who sat within two rows of the infected passenger , and suggests offering tb testing to other passengers on the flights Cdc强烈建议有关航班中与这名感染乘客的座位位置在两排以内的所有乘客进行结核菌素试验，而且建议航班中其他乘客进行结核菌素试验。
The tuberculin reaction that affects naturally among them can keep all one ' s life positive even , and although the person that had not affected n / med tuberculosis bacterium experiments to also do not appear for many times positive response 其中自然感染的结核菌素反应甚至可保持终生阳性，而未感染过结核菌的人即使多次试验也不出现阳性反应。
Ppd is not sensitive enough , furthermore bcg vaccination interferences the diagnosis of tb . for the reasons above , it is very important to develop new vaccine , or enhance bcg effection and diagnosis reagent for finding tb patient timely and specially 同时，由于bcg的广泛接种，使纯化的结核菌素蛋白衍生物( purifiedproteinderivativeoftuberculin ， ppd )诊断试剂特异性不高， tb病例的及时发现成为难题。
You if tuberculin is electropositive , can explain you had affected n / med tuberculosis bacterium only , whether to get tuberculosis , still need by the doctor integrated your clinical expression , phlegmy fluid is bacteriological examine and x line examination undertake an analysis , make final judgement 您假如结核菌素阳性，只能说明您已经感染了结核菌，是否得了结核病，还需由医生综合您的临床表现、痰液细菌学检验和x线检查等进行分析，作出最后判定。
Be based on this one principle , tuberculin is used extensively at infection of the tuberculosis epidemiology investigation , n / med tuberculosis that monitor , tuberculosis differentiate diagnose , object of have an inoculation of choice bcg vaccine and effect of assessment have an inoculation , still can use at deciding the cellular immunity ability of human body 基于这一原理，结核菌素被广泛用于结核病流行病学调查、监测结核感染、结核病的鉴别诊断、选择卡介苗接种对象及考核接种效果，还可以用于判定人体的细胞免疫能力。
