Parasitology Research

, Volume 78, Issue 1, pp 74–77 | Cite as

The expulsion ofEchinostoma trivolvis (Trematoda) from ICR mice: scanning electron microscopy of the worms

  • David M. Kruse
  • Donald W. Hosier
  • Bernard Fried
Original Investigations


Echinostoma trivolvis adults are rejected from ICR mice within 3 weeks postinfection (p.i.) but are retained in golden hamsters for >15 weeks. The present study used scanning electron microscopy (SEM) to examine worm topography in ICR mice, particularly that of the collar spines, and to correlate worm loss with tegumentary changes. The topography of the worm in ICR mice was similar to that observed in previous studies on this echinostome in domestic chick embryos, chickens, and golden hamsters. Observations were made on the pattern of collar spines in 115 worms from ICR mice at 3–14 days p.i. All worms examined at 3 days exhibited extended spines, whereas about 70% of the worms examined at 14 days displayed retracted or missing spines. Eight worms from golden hamsters examined at 14 days p.i. showed extended collar spines. The retraction or loss of collar spines may play a role in the expulsion ofE. trivolvis from ICR mice.


Electron Microscopy Scanning Electron Microscopy Chick Embryo Golden Hamster Domestic Chick 
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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • David M. Kruse
    • 1
  • Donald W. Hosier
    • 2
  • Bernard Fried
    • 1
  1. 1.Department of BiologyLafayette CollegeEastonUSA
  2. 2.Department of BiologyMoravian CollegeBethlehemUSA

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