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Daily emergence of Schistosoma mansoni and S. haematobium cercariae from naturally infected snails under field conditions

Published online by Cambridge University Press:  12 April 2024

C.T. Wolmarans ,
K.N. de Kock ,
H.D. Strauss  and
M. Bornman
C.T. Wolmarans*
Affiliation:
School of Environmental Sciences and Development, Potchefstroom University for CHE, Private Bag X6001, Potchefstroom 2520, South Africa.
K.N. de Kock
Affiliation:
School of Environmental Sciences and Development, Potchefstroom University for CHE, Private Bag X6001, Potchefstroom 2520, South Africa.
H.D. Strauss
Affiliation:
School of Environmental Sciences and Development, Potchefstroom University for CHE, Private Bag X6001, Potchefstroom 2520, South Africa.
M. Bornman
Affiliation:
School of Environmental Sciences and Development, Potchefstroom University for CHE, Private Bag X6001, Potchefstroom 2520, South Africa.
*
*Author for correspondence Fax: 27 18 299 2370, E-mail: [email protected]
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Abstract

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The daily emergence of Schistosoma mansoni and S. haematobium cercariae was investigated under field conditions. Intermediate host snails of both schistosome species were collected during the rainy season, cold dry season and warm dry season and kept separately in test tubes in habitat water. Shed cercariae were collected from each of the test tubes at two hourly intervals, transferred to Petri dishes and counted. Mice were exposed to these cercariae to establish the identity of the schistosome parasites. Peak shedding for both species was observed at 1100 h during the rainy and warm dry seasons and at 0900 h during the cold dry season. Shedding before 0900 h was found only for S. haematobium in the rainy season while shedding after 1700 h occurred only during this season at both species. Shedding observed during 1900 h observation period was in the low category for both species. No shedding was observed during the 2100 h observation period for any of the species and the investigation was discontinued after this period. Only S. haematobium ova were found in the exposed mice.

Type
Research Article
Information
Journal of Helminthology , Volume 76 , Issue 3 , September 2002 , pp. 273 - 277
Copyright
Copyright © Cambridge University Press 2002

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