Intraspecific diversity of Schistosoma haematobium in West Africa: chronobiology of cercarial emergence

Cercarial emergence patterns were used to analyse the intraspecific variability within and between nine populations of Schistosoma haematobium collected along a transect line from the North to the South of the Ivory Coast (Africa) and using Bulinus truncatus or Bulinus globosus as intermediate snail...

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Bibliographic Details
Published in:Acta tropica 1997-06, Vol.66 (1), p.35-44
Main Authors: N'Goran, Eliézer, Brémond, Philippe, Sellin, Elisabeth, Sellin, Bertrand, Théron, André
Format: Article
Language:English
Subjects:
Animals
Bulinus - parasitology
Bulinus globosus
Bulinus truncatus
Cercariae
Chronobiology
Chronobiology Phenomena
Cote d'Ivoire
Geography
Parasite
Schistosoma haematobium
Schistosoma haematobium - growth & development
Variability
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Summary:Cercarial emergence patterns were used to analyse the intraspecific variability within and between nine populations of Schistosoma haematobium collected along a transect line from the North to the South of the Ivory Coast (Africa) and using Bulinus truncatus or Bulinus globosus as intermediate snail hosts. Statistical comparison demonstrated the existence of a chronobiological polymorphism and the existence of three homogenous groups of S. haematobium isolates with mean shedding times of the cercariae decreasing from the North to the South. The chronobiological variability observed was not correlated with the species of Bulinus ( B. truncatus vs. B. globosus) implicated in the parasite transmission but with the climatic and vegetal features of the transmission areas. S. haematobium from shaded sites of the forest zone (South) showed cercarial emergence patterns significantly earliest than that of S. haematobium from open sites of the savanna zone (North). Differences in sensitivity to light intensity could characterize the existence of eco-geographical races of S. haematobium one of the forest, the other from the savanna.
ISSN:0001-706X
1873-6254
DOI:10.1016/S0001-706X(97)00676-1