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Observations on Lymnaea gedrosiana, the intermediate host of Ornithobilharzia turkestanicum in Khuzestan, Iran*

  • J. Massoud (a1)
Abstract

A study of the distribution and population of Lymnaea gedrosiana in relation to the transmission of Ornithobilharzia turkestanicum in various habitats was carried out in Khuzestan.

Populations were higher in canals and swamps than in ponds, with peaks in spring and autumn and low densities in summer and winter.

The reproductive capacity of L. gedrosiana was higher in running water than in stagnant water. The peak reproduction rates occurred in spring and autumn and reproduction continued at a low level in summer but was nil in winter.

Infection with O. turkestanicum was higher in large than in small snails (0.1 %, 0.5% and 1.1% in snails measuring 0.6 mm, 6–10 mm and 10–14 mm respectively). In canals and swamps transmission occurred throughout the year, with a peak in late summer in the former and early summer in the latter. In ponds, most transmission probably occurred in spring and autumn. Drains played a very minor role in transmission.

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References
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Chu, K. Y., Massoud, J. and Arfaa, F. (1968) Distribution and ecology of Bulinus truncatus in Khuzestan, Iran. Bulletin of the World Health Organization, 39, 607637.
Chu, K. Y., Bijan, H. and Massoud, J. (1967) The ability of Bulinus truncatus, Biomphalaria alexandrina and Lymnaea gedrosiana to survive out of water in the laboratory. Annals of tropical Medicine and Parasitology, 61,16.
Gaud, J., Arfaa, F. and Zaini, A. (1962) Observations sur la biologie de Bulinus truncatus au Khuzestan (Iran). Annales de Parasitologie Humaine et Comparee, 37,232275.
Massoud, J., Chu, K. Y. and Arfaa, F. (1969) Field trials of Bayluscide, sodium pentachlorophenate and copper sulphate in standing waters in Iran. Annals of tropical Medicine and Parasitology, 63, 189194.
McCullough, F. S. (1965) A note on intestinal schistosomiasis and the snail host in Ghana. Annals of tropical Medicine and Parasitology, 59,312319.
Mozley, A. (1939) Transactions of the Royal Society of Edinburgh, 59, 687.
Webbe, G. (1962) The transmission of Schistosoma haematobium in an area of Lake Province, Tanganyka. Bulletin of the World Health Organization, 27, 5985.
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Journal of Helminthology
  • ISSN: 0022-149X
  • EISSN: 1475-2697
  • URL: /core/journals/journal-of-helminthology
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