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Histoplasmosis in Solid Organ Transplantation
Nicolas Barros1,2,3, L Joseph Wheat3
1Department of Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
Abstract:
Histoplasma capsulatum, the etiological agent for histoplasmosis, is a dimorphic fungus that grows as a mold in the environment and as a yeast in human tissues. It has a broad global distribution with shifting epidemiology during recent decades. While in immunocompetent individuals infection is usually self-resolving, solid organ transplant recipients are at increased risk of symptomatic disease with dissemination to extrapulmonary tissue. Diagnosis of histoplasmosis relies on direct observation of the pathogen (histopathology, cytopathology, and culture) or detection of antigens, antibodies, or nucleic acids. All transplant recipients with histoplasmosis warrant therapy, though the agent of choice and duration of therapy depends on the severity of disease. In the present article, we describe the pathogenesis, epidemiology, clinical manifestations and management of histoplasmosis in solid organ transplant recipients.
Insights
Histoplasmosis, caused by Histoplasma capsulatum, poses a significant risk to solid organ transplant recipients, often leading to severe disease. Prompt diagnosis and tailored therapy are crucial for managing this fungal infection in this vulnerable population.
Area of Science:
- Medical Mycology
- Infectious Diseases
- Transplant Medicine
Background:
- Histoplasma capsulatum is a dimorphic fungus causing histoplasmosis.
- While typically self-resolving in immunocompetent individuals, it presents a higher risk for solid organ transplant (SOT) recipients.
- SOT recipients face increased risk of symptomatic disease and dissemination.
Purpose of the Study:
- To review the pathogenesis, epidemiology, clinical manifestations, and management of histoplasmosis.
- To highlight the specific challenges and considerations for SOT recipients.
- To provide a comprehensive overview for clinicians managing this population.
Main Methods:
- Literature review focusing on Histoplasma capsulatum in SOT recipients.
- Synthesis of information on diagnosis, treatment, and outcomes.
- Analysis of epidemiological trends and risk factors.
Main Results:
- Histoplasmosis diagnosis in SOT recipients relies on direct pathogen observation or detection of antigens, antibodies, or nucleic acids.
- All SOT recipients with histoplasmosis require treatment.
- Treatment choice and duration are guided by disease severity.
Conclusions:
- Histoplasmosis is a serious concern in SOT recipients, with potential for extrapulmonary dissemination.
- Early diagnosis and appropriate antifungal therapy are essential for favorable outcomes.
- Management strategies must be individualized based on clinical presentation and disease severity.
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