近年来血吸虫病流行病学的各方面已有很大进展,但为了重新制定防制策略,有必要评述有关流行病学现状的知识。一、寄生虫(一)血吸虫的分类学与生理学:为了确定血吸虫的种类和进一步了解现有种类之间的相互关系,已致力于对寄生虫虫卵、尾蚴及成虫的研究。对于感染埃及血吸虫或间插血吸虫(S.intercalatum)“终端刺卵”的患 Much progress has been made in all aspects of the epidemiology of schistosomiasis in recent years, but it is necessary to comment on the current state of epidemiology in order to reformulate strategies for control. I. Parasites (1) Taxonomy and physiology of schistosomiasis: In order to determine the species of schistosomiasis and to further understand the interrelationships among the existing species, research has been devoted to parasitoid eggs, cercariae and adults. For patients infected with S. japonicum or S. intercalatum “terminal spurs”