应用流行病学指标——死亡率、患病率、感染率等以权衡某个人群的流行轻重,或考察某个人群不同时期的情况差异,是人所共知的。但这些指标还具有一个不太明显的作用,即使用它指导重点工作,这一点似乎应当提起注意。原来,结核病的流行是一系列不同程度的暴发流行的总和,因此多年来即提出过“处女地”的学说,要控制结核病必须从消灭暴发流行入手。以往很多年的事例,可以证明某个居民点与外界很少联系,若突 It is well-known that epidemiological indicators such as mortality, prevalence and infection rate should be weighed against the prevalence of a particular population or to examine the differences in circumstances of different populations over time. However, these indicators also have a less pronounced role, and it seems that attention should be drawn to the use of it to guide priority work. It turned out that the prevalence of tuberculosis is a series of outbreaks of varying degrees of the sum of the epidemic so many years that the proposed “virgin land” theory, to control tuberculosis must eliminate the outbreak of epidemic start. The past many years of examples can prove that a residential area with little contact with the outside world, if suddenly