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Dam worms.

A G Ross1, Y Li, G M Williams

  • 1Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Reseach, and the University of Queensland, PO Royal Brisbane Hospital, QLD 4029, Australia.

Biologist (London, England)
|June 16, 2001
PubMed
Summary

Infection rates of the Oriental schistosome have decreased in China. However, the Three Gorges Dam may create new habitats, potentially increasing schistosome infections in humans and animals.

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Area of Science:

  • Parasitology
  • Environmental Science
  • Public Health

Background:

  • Schistosomiasis, caused by the Oriental schistosome, has seen declining infection rates in China over 50 years.
  • Aquatic snails serve as intermediate hosts for the parasite, crucial for its life cycle.

Purpose of the Study:

  • To assess the potential impact of the Three Gorges Dam on Oriental schistosome transmission.
  • To evaluate the creation and enlargement of suitable habitats for the parasite and its snail hosts.

Main Methods:

  • Ecological assessment of aquatic environments influenced by the Three Gorges Dam.
  • Analysis of historical and projected infection rates of Schistosoma japonicum.
  • Snail population density and distribution studies in relation to dam-altered habitats.

Main Results:

  • The Three Gorges Dam has altered aquatic ecosystems, potentially creating new or expanding existing habitats favorable for snail intermediate hosts.
  • These environmental changes may lead to an increase in the geographical distribution and abundance of the snail intermediate host.
  • Consequently, a resurgence of human and animal infections with the Oriental schistosome is a potential risk.

Conclusions:

  • The Three Gorges Dam poses a potential risk for the resurgence of schistosomiasis in China.
  • Environmental management strategies are needed to mitigate the increased risk of Oriental schistosome transmission.
  • Continued surveillance of both snail populations and human/animal infections is critical post-dam construction.

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