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Related Experiment Videos

Toxoplasmosis in coypu

R G Holmes, O Illman, J K Beverley

    The Veterinary Record
    |July 23, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Toxoplasmosis is common in Norfolk coypus, with a low-virulence strain identified. Coypus showed remarkable resistance to even highly virulent strains, indicating strong immunity to toxoplasmosis.

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    Area of Science:

    • Veterinary Parasitology
    • Wildlife Disease Ecology
    • Infectious Diseases

    Background:

    • Toxoplasmosis is a widespread parasitic infection.
    • Coypus (Myocastor coypus) are an established invasive species in Norfolk, UK.
    • The prevalence and impact of toxoplasmosis in coypu populations are not well understood.

    Purpose of the Study:

    • To investigate the presence and characteristics of Toxoplasma gondii infection in Norfolk coypus.
    • To assess the virulence and host-pathogen interactions of T. gondii strains in coypus.
    • To evaluate the immune response and resistance of coypus to toxoplasmosis.

    Main Methods:

    • Serological surveys using the dye test to detect toxoplasma antibodies.
    • Isolation and characterization of T. gondii strains from infected coypus.

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  • Experimental infection studies with different T. gondii strains, including challenge experiments.
  • Monitoring for clinical signs, congenital transmission, and antibody persistence.

    • Main Results:

    • Serological evidence confirmed common toxoplasmosis in Norfolk coypus.
    • A low-virulence, tissue cyst-producing strain of T. gondii was isolated.
    • Congenital toxoplasmosis was observed in captive-born coypus.
    • Coypus exhibited high resistance to a virulent RH strain of T. gondii, showing no illness even when uninfected.
    • High antibody titers (≥1:100,000) were developed, persisting for at least one year.

    Conclusions:

    • Coypus in Norfolk are frequently infected with Toxoplasma gondii.
    • Coypus possess significant natural resistance to toxoplasmosis, even against virulent strains.
    • The findings have implications for understanding parasite transmission dynamics in invasive species and wildlife health.