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Related Experiment Videos

Postmetacercarial changes in Echinostoma caproni maintained in a defined medium plus calf serum.

B Fried1, A Reddy

  • 1Department of Biology, Lafayette College Easton, Pa 18042, USA. friedb@lafayette.edu

The Korean Journal of Parasitology
|September 26, 2000
PubMed
Summary

This study observed Echinostoma caproni metacercariae in culture, noting changes like excretory concretion voiding and oral collar flaring. Some organisms developed posterior bumps and blebs, with some mortality by day 5.

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Area of Science:

  • Helminthology
  • Parasitology
  • Developmental Biology

Background:

  • Echinostoma caproni is a trematode parasite.
  • Understanding metacercarial development is crucial for parasite life cycle studies.

Purpose of the Study:

  • To investigate the postmetacercarial developmental changes of Echinostoma caproni.
  • To observe morphological alterations in excysted metacercariae in vitro.

Main Methods:

  • Excysted Echinostoma caproni metacercariae were cultured in Medium 199 with 20% calf serum at 41°C for 7 days.
  • Cultures were maintained in closed centrifuge tubes under atmospheric air, with antibiotics.
  • Observations focused on morphological changes, excretory concretion voiding, and mortality.

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Main Results:

  • Most metacercariae voided excretory concretions by day 4.
  • Observed changes included oral collar flaring and tegumentary spine extension.
  • Posterior protuberances and vesicular growths/blebs were noted in some organisms by day 4.
  • Some mortality occurred by day 5, with most surviving until day 7.

Conclusions:

  • Echinostoma caproni metacercariae undergo significant morphological changes in vitro.
  • The observed changes, including abnormal growths, may indicate stress or developmental processes in culture.
  • Further research is needed to elucidate the implications of these in vitro changes for parasite development and infectivity.