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Related Experiment Videos

Host factors limiting monogenean infections: a case study.

R C Tinsley1, J A Jackson

  • 1School of Biological Sciences, University of Bristol, BS8 1UG, Bristol, UK. r.c.tinsley@bristol.ac.uk

International Journal for Parasitology
|February 12, 2002
PubMed
Summary
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Parasitic worm burdens in amphibians are low due to host immunity and environmental factors. Studies on Protopolystoma xenopodis reveal acquired immunity significantly reduces subsequent infections in Xenopus laevis.

Area of Science:

  • Parasitology
  • Amphibian Biology
  • Ecology

Background:

  • Polystomatid monogeneans, parasites of amphibians, typically exhibit low infection prevalence and intensity.
  • Host factors are believed to be the primary regulators of parasite burdens, overriding transmission success variations.

Purpose of the Study:

  • To review Pseudodiplorchis americanus, a parasite of Scaphiopus couchii.
  • To detail the factors regulating infrapopulations of Protopolystoma xenopodis in Xenopus laevis.
  • To investigate the role of acquired immunity in regulating parasite burdens.

Main Methods:

  • Review of existing data on Pseudodiplorchis americanus.
  • Analysis of factors influencing Protopolystoma xenopodis populations, including environmental, host, and parasite variables.

Related Experiment Videos

  • Long-term laboratory experiments on Xenopus laevis and Protopolystoma xenopodis interactions, including challenge infections.

    • Main Results:

    • Infection levels are regulated by temperature, host behavior, population density, and parasite competition.
    • Significant parasite number attrition occurs between invasion and maturity.
    • Xenopus laevis exhibits a strong acquired immune response, reducing subsequent Protopolystoma xenopodis infections.

    Conclusions:

    • Acquired immunity in Xenopus laevis explains the low parasite burdens observed in field studies.
    • Post-infection immunity likely limits parasite loads in adult amphibians.
    • Environmental and host factors, alongside parasite-specific traits, modulate parasite transmission and population dynamics.