NCVP - National Center for Veterinary Parasitology

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  • Home
  • Resources
    • People >
      • Directors and Advisory Board
      • Residents >
        • Boehringer Ingelheim Resident
        • Elanco Resident
        • IDEXX Resident
        • Merck Resident
        • Zoetis Resident
      • NCVP Alums
      • Clinical Parasitology Support
      • Additional Support
      • Sponsors
    • Parasite Image Database >
      • Protozoa
      • Arthropods
      • Nematodes
      • Trematodes
      • Cestodes
      • Acanthocephala
      • Tick-Borne Disease Agents
    • Case of the Month
    • Teaching and Research Materials >
      • Teaching Specimen Request
      • Parasite Jeopardy Games
      • Parasite Videos
    • Online Resources >
      • Parasitology Board Preparation
      • Additional Parasitology Resources
      • Resources for Educators
    • NCVP Board Member Resources
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  • News
    • Veterinary Parasitology in the News
    • NCVP Newsletter
  • Opportunities
    • Request for Proposals
    • Residency Application
    • Continuing Education in Parasitology
    • Positions Open in Veterinary Parasitology

Case of the Month

May 2020

 

Rats!

A fecal sample from a 2 year-old male rat rescued from a hoarding situation, was submitted for gastrointestinal parasites evaluation. The rat did not show any symptoms at submittal but the feces was soft in consistency.

For fecal analysis, a centrifugal fecal flotation with Sheather’s sugar solution (specific gravity, 1.26) was performed, and a low number of eggs were observed.
Picture
What's your diagnosis?
Trichosomoides crassicauda or bladder threadworm, is a parasite of the urinary bladder of rats. The female is 10–19 mm long; the male measures 1.5–3.5 mm.  A curious fact about this parasite is that the male lives inside the uterus of its mate (hyperparasite).  

The medium‐sized egg is lemon‐shaped with transparent polar plugs and measures about 60–70 by 30–36 μm. The shell is thick and brown, and contains either a morula or an L1 larva. 
 
How did the rat become infected? Usually from mother rats to their offspring before weaning. 

Is it pathogenic? The presence of the worms can cause nodules in the bladder wall.
 
How do you treat it? In laboratory animals successful treatment has been achieved with Ivermectin subcutaneously at 0.2 mg/kg or orally at 3mg/kg.

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