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Journal of Chemical Ecology

, Volume 12, Issue 8, pp 1805–1816 | Cite as

Limitations to schistosome growth and maturation in nonpermissive hosts

  • Donato Cioli
  • Livia Pica-Mattoccia
  • Paul M. Knopf
Article
  • 35 Downloads

Abstract

The life cycle of schistosomes is reviewed in its various steps, both in permissive hosts (in which the cycle is completed) and in nonpermissive hosts (which excrete no viable eggs as a result of the infection). A large worm loss occurs at (or after) the lung stage in both types of hosts (“normal attrition”) and some nonpermissive hosts (like the rat) have an additional elimination of worms from the portal circulation. Worm growth and reproductive maturation are also impaired in several nonpermissive hosts and the possible host-parasite interactions leading to such limitations are discussed, with special reference to hormonal influences. Attention is also given to peculiar phenomena occurring in some hosts, like the late portal worm elimination in rhesus monkeys, the migration from mesenteric veins to lungs in rats, and the block to egg excretion in guinea pigs. The steps of the schistosome life cycle which appear vulnerable in several hosts are contrasted with the steps which are carried out successfully in the majority of hosts studied.

Key words

Schistosomes Schistosoma mansoni permissive and nonpermissive hosts reproductive maturation hormones 

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Copyright information

© Plenum Publishing Corporation 1986

Authors and Affiliations

  • Donato Cioli
    • 1
  • Livia Pica-Mattoccia
    • 1
  • Paul M. Knopf
    • 2
  1. 1.Institute of Cell BiologyRomeItaly
  2. 2.Division of Biology and MedicineBrown UniversityProvidence

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