PMID: 9177094Jun 24, 1997Paper

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

Acta Tropica
E N'GoranA Théron

Abstract

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 homogeneous 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 area. 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.

References

Mar 1, 1988·Behavior Genetics·A Théron, C Combes
Mar 1, 1997·Journal of Helminthology·N Kechemir, A Théron

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Citations

Feb 8, 2014·Parasite : Journal De La Société Française De Parasitologie·Rodrigue Mintsa-NguémaGabriel Mouahid
Feb 27, 2018·PLoS Pathogens·Kimberley F PriorSarah E Reece

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