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Related Experiment Videos

Protothecosis with ocular involvement in a dog.

N Buyukmihci, L F Rubin, A DePaoli

    Journal of the American Veterinary Medical Association
    |July 15, 1975
    PubMed
    Summary

    A dog diagnosed with Prototheca infection experienced chronic diarrhea and sudden blindness. The organism was found in multiple organs, including the eyes, indicating a systemic infection.

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    Area of Science:

    • Veterinary Medicine
    • Infectious Diseases
    • Ophthalmology

    Background:

    • Prototheca species are ubiquitous algae-like organisms that can cause infections in various animal species.
    • Algal infections can manifest with diverse clinical signs depending on the affected organs.
    • Ocular and gastrointestinal involvement are known, but systemic dissemination can occur.

    Purpose of the Study:

    • To report a case of Prototheca infection in a dog presenting with chronic diarrhea and sudden blindness.
    • To document the diagnostic findings, including organism identification and distribution.
    • To highlight the potential for systemic spread of Prototheca in canines.

    Main Methods:

    • Clinical examination and history taking.
    • Ophthalmic evaluation, including fundic examination.
    • Diagnostic sample collection (subretinal fluid) and necropsy.
    • Microscopic identification of the causative organism.

    Main Results:

    • An 8 1/2-year-old Collie dog presented with chronic diarrhea and acute blindness.
    • Leukokoria was noted in the right eye.
    • An organism morphologically consistent with Prototheca sp. was isolated from subretinal fluid.
    • Necropsy revealed Prototheca in the eyes, gastrointestinal tract, lungs, lymph nodes, kidneys, heart, abdominal fat, and omentum.

    Conclusions:

    • Prototheca infection should be considered in dogs with unexplained chronic diarrhea and ocular disease, particularly blindness.
    • Systemic dissemination of Prototheca can lead to multi-organ involvement.
    • Early diagnosis and understanding the full extent of infection are crucial for prognosis and management.

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