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The cercarial emergence of Schistosoma japonicum from Oncomelania quadrasi under outdoor conditions in the Philippines

Published online by Cambridge University Press:  18 November 2009

Kenjiro Kawashima ,
Bayani L. Blas  and
Alfredo T. Santos Jr
Kenjiro Kawashima
Affiliation:
Laboratory of Medical Zoology, School of Health Sciences, Kyushu University, Fukuoka 812, Japan.
Bayani L. Blas
Affiliation:
Schistosomiasis Control and Research Project, Ministry of Health, Palo, Leyte, Philippines
Alfredo T. Santos Jr
Affiliation:
Schistosomiasis Control and Research Project, Ministry of Health, Palo, Leyte, Philippines
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Abstract

The cercarial emergence of Schistosoma japonicum from Oncomelania quadrasi was observed under outdoor conditions in Leyte, Philippines. Nocturnal periodicity of the emergence within 24 hours was recognized. Peak emergence usually occurs between 18:00 and 20:00 and occasionally between 8:00 and 10:00. The peaks were usually synchronized with a sudden lowering of water temperature and light intensity and occasionally with their increase. As the nocturnal periodicity of the emergence was observed in the dark and outdoors, it was suggested that emergence might be dependent on temperature, which is secondarily influenced by photoperiodicity and light intensity.

Type
Research Article
Information
Journal of Helminthology , Volume 59 , Issue 3 , September 1985 , pp. 225 - 231
Copyright
Copyright © Cambridge University Press 1985

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References

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