Development and Effects of Schistosoma japonicum (Trematoda) on its Intermediate Host, Oncomelania hupensis (Gastropoda).

摘要: Background: Trematodes belonging to the genus Schistosoma cause schistosomiasis. The relationship between schistosomes and their intermediate hosts varies among snails. This study investigated effects of S. japonicum on its snail host, Oncomelania hupensis, cercarial release rythmicity light it. Methods: : Seven groups O. hupensis (n = 40 each) were exposed individually 0 (control), 2, 4, 6, 10, 15, 20 miracidia. Mortality snails was recorded for 10 weeks. Snails in each group checked infection at seven weeks post-exposure. Positive arti-ficial from 06:00 am – 18:00 pm liberated cercariae collected every 2 hours de-termine rhythmicity release. Three positive 6 ex-posed artificial light, daylight, darkness pm, determine light. Results highest rate host mortality occurred 15 Cercariae after eight exposure S . circarial emerging pattern circadian, with a single peak 10:00 12:00 pm. Light intensity had influence shedding rhythmicity. Conclusion Further research, including biotic abiotic factors is deemed neces-sary fine-tune elucidation upon snail.