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Progressive cutaneous protothecosis
Abstract:
The diagnosis of severe progressive cutaneous protothecosis in a 34-year-old woman was made by skin biopsy and culture. Analysis of host defense mechanisms revealed a persistent defect in the ability of the patient's PMN to kill the infecting organism. Specific IgG and IgE antibody was demonstrated. Serum levels of complement and immunoglobulins were normal or elevated. The patient was not anergic and peripheral blood lymphocytes responded to nonspecific mitogens. Treatment with amphotericin B and tetracycline resulted in resolution of skin lesions and negative cultures.
Insights
A woman with severe cutaneous protothecosis had a defect in polymorphonuclear leukocytes (PMN) killing ability. Treatment with antifungals led to lesion resolution and negative cultures, indicating successful therapy.
Area of Science:
- Medical Mycology
- Immunology
- Dermatology
Background:
- Cutaneous protothecosis is a rare infection caused by Prototheca species, often affecting immunocompromised individuals.
- Diagnosis typically involves skin biopsy and microbial culture.
- Understanding host immune responses is crucial for managing this challenging infection.
Observation:
- A 34-year-old woman presented with severe, progressive cutaneous protothecosis.
- Skin biopsy and culture confirmed the diagnosis.
- Analysis revealed a persistent defect in polymorphonuclear leukocyte (PMN) function, specifically impaired killing of the Prototheca organism.
Findings:
- The patient demonstrated specific IgG and IgE antibodies against the pathogen.
- Serum complement and immunoglobulin levels were normal or elevated.
- Cellular immunity appeared intact, with lymphocytes responding to mitogens and no anergy observed.
Implications:
- This case highlights a specific immune defect (impaired PMN killing) in cutaneous protothecosis.
- Successful treatment with amphotericin B and tetracycline suggests effective therapeutic options.
- Further research into immune defects may guide personalized treatment strategies for protothecosis.