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[Histoplasmosis]
Abstract:
Histoplasmosis are deep mycoses of present interest: they are part of fungal diseases of A.I.D.S. American histoplasmosis at Histoplasma capsulatum is a world wide disease, particularly present in the U.S.A., time to time observed in Africa south of the Sahara primarily among Europeans. African histoplasmosis at H. duboisii is typically an African continent disease. H. capsulatum is a telluric fungus and man is contaminated from soil to his respiratory tract. It depends on his immunitary status that he develops either a non symptomatic affection or a severe one, even a fatal one. Epidemiology of H. duboisii is still full of unknowns. Pathological manifestations of each disease are very different: American histoplasmosis displays three stages: primary infection, spread attacks spontaneously fatal, chronic pulmonary form simulating sometimes a pseudo-tumor, pathologic manifestations of African histoplasmosis, studied from 206 cases already published, are primarily related to skin, glands and bones attack, displaying either a localized form or an immediately spread form. Diagnosis is based on finding the fungus in different samples, on research of sera-antibodies, often on anatomopathological investigations. At the present time, ketoconazole is the treatment. Histoplasmosis at H. capsulatum as well as at H.duboisii might appear outside endemic zones several years after contamination.
Insights
Histoplasmosis, a fungal infection, presents differently in American and African forms, impacting various organs. Diagnosis involves identifying the fungus, antibodies, and pathology, with ketoconazole as the current treatment.
Area of Science:
- Medical Mycology
- Infectious Diseases
Context:
- Histoplasmosis is a significant deep fungal infection, particularly relevant in the context of Acquired Immunodeficiency Syndrome (AIDS).
- Two distinct forms exist: American histoplasmosis (Histoplasma capsulatum) and African histoplasmosis (Histoplasma duboisii).
- H. capsulatum is globally distributed, prevalent in the USA, and occasionally seen in sub-Saharan Africa, while H. duboisii is endemic to the African continent.
Purpose:
- To differentiate the epidemiology, pathology, and diagnosis of American and African histoplasmosis.
- To highlight the etiological agents, Histoplasma capsulatum and Histoplasma duboisii.
- To discuss diagnostic methods and current treatment strategies for histoplasmosis.
Summary:
- Histoplasmosis is caused by telluric fungi, with transmission occurring via inhalation from soil. Disease severity depends on the host's immune status, ranging from asymptomatic to fatal.
- American histoplasmosis (H. capsulatum) manifests in three stages: primary infection, disseminated disease, and chronic pulmonary forms. African histoplasmosis (H. duboisii) primarily affects skin, glands, and bones, presenting as localized or disseminated forms.
- Diagnosis relies on identifying the fungus in clinical samples, serological antibody detection, and histopathological examination. Ketoconazole is the established treatment.
Impact:
- Provides a comparative overview of two major histoplasmosis forms, aiding in differential diagnosis.
- Emphasizes the etiological agents and their geographic distribution, crucial for epidemiological understanding.
- Clarifies diagnostic approaches and therapeutic interventions for histoplasmosis, informing clinical practice and public health strategies.