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Observations on the field transmission dynamics of Schistosoma mansoni and S. mattheei in southern Natal, South Africa

Published online by Cambridge University Press:  06 April 2009

Fiona A. Donnelly  and
C. C. Appleton
Fiona A. Donnelly
Affiliation:
Research Institute for Diseases in a Tropical Environment, South African Medical Research Council, P.O. Box 17120, Congella 4013, Republic of South Africa
C. C. Appleton
Affiliation:
Research Institute for Diseases in a Tropical Environment, South African Medical Research Council, P.O. Box 17120, Congella 4013, Republic of South Africa
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Extract

Cercarial transmission of Schistosoma mansoni and S. mattheei was monitored in two small rivers near Durban, South Africa. The seasonal patterns recorded corresponded to those already documented for these parasites. Tn the case of S. mansoni, however, this was interrupted at the height of the transmission season. The reason for this was believed to be very low oxygen concentrations in the snail habitat due to unusually extensive growth of the plant Ludwigia stolonifera over the water. The failure of the spring rains, which would normally have flushed the system is seen as contributing to this phenomenon. Infection rates in the snail intermediate hosts were low ( > 10%). A preponderance of male worms of both schistosome species was noted.

Type
Research Article
Information
Parasitology , Volume 91 , Issue 2 , October 1985 , pp. 281 - 290
Copyright
Copyright © Cambridge University Press 1985

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