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Effect of Light on Cercarial Emergence from Oncomelania Hupensis chiui Infected with Formosan and Philippine Strains of Schistosoma japonicum

Yonsei Reports on Tropical Medicine 1972년 3권 1호 p.81 ~ 85
Wang, Yi-Chang, Fan, Ping-Chin,
소속 상세정보
 ( Wang, Yi-Chang ) - Taiwan Veterans General Hospital, VACRS Department of medical Research & Parasitology Laboratory
 ( Fan, Ping-Chin ) - Taiwan National Defense Medical Center Department of medical Biomorphics

Abstract


O.h. chiui infected with either Formosan(Changhua) or Philippine strain of S. japonicum were divided into three series to submerge into dechlorinated tap water in 5-ml vials at 7 a.m., 3 p.m., and 11 p.m. of the day of experiment, then they were examined 2-hourly when exposed either to continuously fluorescent light or to clay light and darkness at night for 40 hours to deter-mine the sequence of their cercarial emergence.
Results Showed a afternoon (3^11 p.m.) cycle for cercariae of Philippine strain of S. japonicum and a tendency of diurnal periodicity for cercariae of Formosan(Changhua) strain of S. japonicum to emerge from 0.h. chiui. After snails of 0.h. chiui were submerged in water, S. japonicum cercariae of Formosan(Changhua) strain were much earlier than those of Philippine strain to emerge from their snail hosts. Light stimulated cercariae of both Formosan(Changhua) strain and Philippine strain of S. japonicum earlier to emerge from their snail hosts. Factors might affect cercarial shedding of S. japonicum were also discussed in the present paper.

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