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A 5-year-old Basenji Mix achieved extended survival with treatment for disseminated protothecosis. The dog originally presented with iridal hyperemia and ocular ultrasonographic examination revealed a mass effect. Histopathology revealed ocular protothecosis and staging confirmed disseminated protothecosis. Treatment with itraconazole and amphotericin B (AmB) infusions resulted in remission. Four years later, restaging revealed recurrence of infection in colonic biopsy samples. An extended AmB protocol was restarted for a cumulative dose of 84 mg/kg and the dog received isavuconazole based on susceptibility testing. The dog was euthanized 4 years and 8 months after initial diagnosis due to decline of neurologic status. Necropsy confirmed the presence of disseminated protothecosis in multiple arteries, multiple lymph nodes, the pituitary gland, thyroid glands, kidneys, colon, cecum, right eyelid, right eye, heart, brain, and periosteum of one bone associated with the middle ear. This report documents the extended survival of a dog with widespread disseminated protothecosis after prolonged administration of AmB.
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http://dx.doi.org/10.1111/jvim.70231 | DOI Listing |
Int J Infect Dis
September 2025
Department of Laboratory Medicine, Shanghai East Hospital, School of Life Sciences and Technology, Tongji University, Shanghai, 200092, China. Electronic address:
Prototheca, a genus of opportunistic pathogenic microalgae, can cause protothecosis in humans and animals, manifesting as cutaneous lesions or disseminated/systemic infections. This report describes a rare case of Prototheca wickerhamii toe infection in a 78-year-old Chinese male, presenting initially as gouty arthritis. The patient, who worked in fish farming with frequent water exposure, had a history of herpes zoster and hypertension.
View Article and Find Full Text PDFJ Vet Intern Med
August 2025
Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, USA.
A 5-year-old Basenji Mix achieved extended survival with treatment for disseminated protothecosis. The dog originally presented with iridal hyperemia and ocular ultrasonographic examination revealed a mass effect. Histopathology revealed ocular protothecosis and staging confirmed disseminated protothecosis.
View Article and Find Full Text PDFJ Vet Intern Med
May 2025
Centre for Veterinary Education, Sydney School of Veterinary Science, The University of Sydney, Sydney, Australia.
Protothecosis is a rare and unusual disease that affects both humans and animals, including dogs. The causative agents are unicellular, achlorophyllous, "yeast-like" microalgae of the genus Prototheca (Trebouxiophyceae, Chlorophyta). Although usually saprophytic, Prototheca may, under conditions of immunologic compromise, become pathogenic and even lethal to the host.
View Article and Find Full Text PDFRev Argent Microbiol
February 2025
Universidad de Buenos Aires, CONICET, Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM), Paraguay 2155, Piso: 12, 1121 Ciudad Autónoma de Buenos Aires, Argentina.
Protothecosis is an infectious disease caused by microalgae of the genus Prototheca. Prototheca can be found in soil and water and transiently colonize animals. Cutaneous protothecosis can involve not only the skin but also the underlying subcutaneous tissue and lymph nodes.
View Article and Find Full Text PDFVet Res Commun
January 2025
Facultad de Ciencias Veterinarias. Cátedra de Enfermedades Infecciosas, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina.
Protothecosis is a severe, emerging opportunistic infection caused by the saprophytic, achlorophyllous microalgae of the genus Prototheca. Though uncommon, human and animal cases are increasing worldwide, making awareness of this fungal-like pathogen important in both human and veterinary medicine. We report a fatal case of disseminated protothecosis caused by P.
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