血清学检查法能发现隐性感染或顿挫型感染,区别现症病人和既往病人,也可借此确定疫源地的界限和结构,这对虫媒性疾病和自然疫源性疾病颇为重要。本文目的就在于阐明流行区内有病史者抗体的持续时间并研究居民中的免疫结构。 Serological test can detect latent infection or frustrated infection, the distinction between patients and past patients, but also to determine the boundaries and structure of the foci, which is important for insect-borne diseases and natural foci of disease . The purpose of this article is to elucidate the duration of antibodies in those with a history of endemic areas and to study the immune structures in the population.