Veen J
Royal Netherlands Tuberculosis Association, The Hague.
Tuber Lung Dis. 1992 Apr;73(2):73-6. doi: 10.1016/0962-8479(92)90058-R.
In a low prevalence country with no systematic BCG vaccination and a low frequency of environmental mycobacterial infections, for each recognized case of tuberculosis or infection with M. tuberculosis source detection should be undertaken. Sometimes this search will lead to discovery of a microepidemic. The extent of contact screening in a microepidemic can easily be determined if observed group prevalences are compared to expected group prevalences. The described method illustrates this search for contacts in concentric circles around the source case: the stone-in-the-pond principle.
在一个未进行系统性卡介苗接种且环境分枝杆菌感染频率较低的低发病率国家，对于每一例确诊的结核病病例或结核分枝杆菌感染病例，都应进行传染源检测。有时这种检测会发现小规模流行。如果将观察到的群体患病率与预期的群体患病率进行比较，就可以很容易地确定小规模流行中接触者筛查的范围。所描述的方法说明了围绕传染源病例以同心圆方式寻找接触者的过程：即投石入池原理。
