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Histoplasmosis and blastomycosis
1Division of Infectious Diseases, University of Arkansas for Medical Sciences, Little Rock 72205, USA.
Summary
Histoplasmosis and blastomycosis are serious fungal infections diagnosed by yeast visualization or culture. Itraconazole is the preferred treatment, with amphotericin B for severe cases.
Area of Science:
- Mycology
- Infectious Diseases
- Medical Mycology
Background:
- Histoplasmosis and blastomycosis are endemic/epidemic dimorphic fungal infections.
- They present a spectrum of illness, from subclinical to progressive disseminated disease.
- Dimorphic fungi, Histoplasma capsulatum and Blastomyces dermatitidis, cause these distinct mycoses.
Purpose of the Study:
- To review the diagnosis and treatment of histoplasmosis and blastomycosis.
- To differentiate clinical presentations and risk factors for each disease.
- To highlight current therapeutic recommendations for these fungal infections.
Main Methods:
- Literature review of histoplasmosis and blastomycosis.
- Analysis of diagnostic methods, including microscopy and culture.
- Evaluation of treatment guidelines and drug efficacy.
Main Results:
- Diagnosis relies on yeast visualization in tissue or fungal culture.
- Itraconazole is the primary treatment; amphotericin B is reserved for life-threatening infections.
- Histoplasmosis can manifest as acute pulmonary, chronic pulmonary, or disseminated disease, particularly in immunocompromised individuals.
- Blastomycosis presents with pulmonary and extrapulmonary manifestations, mimicking other conditions like pneumonia, cancer, or tuberculosis.
Conclusions:
- Accurate diagnosis through direct visualization or culture is crucial.
- Antifungal therapy choice depends on disease severity.
- Understanding the varied presentations and risk factors aids in timely management of these fungal diseases.