PESIGAN T P, HAIRSTON N G, JAUREGUI J J, GARCIA E G, SANTOS A T, SANTOS B C, BESA A A
Bull World Health Organ. 1958;18(4):481-578.
This study of the molluscan host (Oncomelania quadrasi) of bilharziasis in the Philippines is divided into two parts, the first dealing with the biology of the host and the second with the interrelationship between the host and Schistosoma japonicum.In the first part, the snail's distribution and habitat are considered in some detail, and then field and laboratory studies on its behaviour and activity are reported on. A section on the life history of O. quadrasi covers its growth, reproduction, egg-laying and survival. This is followed by a study of the population dynamics of the snail.In the second part, the laboratory procedures used for infecting snails and for obtaining cercariae are described, and the finding that more female than male snails are seen infected is discussed. A section is devoted to the effect of infection on the reproduction, growth and longevity of the snail, and an account is given of cercarial output, of the distribution of cercariae in a snail colony and of their presence downstream from snail colonies. The final section deals with natural fluctuations in snail infection rates, which appear to show a cycle related to rainfall.
这项关于菲律宾血吸虫病软体动物宿主（拟钉螺）的研究分为两个部分，第一部分探讨宿主的生物学特性，第二部分研究宿主与日本血吸虫之间的相互关系。在第一部分中，详细考察了钉螺的分布和栖息地，随后报告了关于其行为和活动的野外及实验室研究。关于拟钉螺生活史的章节涵盖了其生长、繁殖、产卵和存活情况。接下来是对钉螺种群动态的研究。在第二部分中，描述了用于感染钉螺和获取尾蚴的实验室程序，并讨论了观察到感染的雌螺比雄螺更多这一发现。有一部分专门论述感染对钉螺繁殖、生长和寿命的影响，并说明了尾蚴产量、尾蚴在钉螺群体中的分布情况以及它们在钉螺群体下游的存在情况。最后一部分讨论钉螺感染率的自然波动，这种波动似乎呈现出与降雨相关的周期。
