集中圈概念(Concentric Ring Concept)是近年来随着结核疫情的变化以及非典型分枝杆菌感染而提出的一种调查概念。这一概念必须具有以下的基本条件才能加以应用,即:一、以涂片查痰发现出菌阳的结核病人,二、必须了解各类人群的感染情况。根据集中圈概念,具体应用时要按以下的步骤进行:(1)首先以涂片法发现菌阳病人。(2)将与菌阳病人的密切接触者划为第一圈(如家人)。(3)将与菌阳病人较为密切的接触 Concentric Ring Concept is a survey concept proposed in recent years with the change of tuberculosis epidemic and the atypical mycobacterium infection. This concept must have the following basic conditions to be applied, namely: First, smear sputum found out of the bacterium Yang tuberculosis patients, Second, we must understand the various types of human infections. According to the concept of concentration circle, the specific application should be carried out according to the following steps: (1) smear method first smear positive patients. (2) The first contacts (such as family members) should be designated as close contacts with bacteria positive. (3) will be more close contact with bacteria positive patients