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[Histoplasmosis due to Histoplasma capsulatum capsulatum and HIV infection]
M el Guedj1, P Couppié, R Pradinaud
1Service de médecine interne, hôpital Saint-Louis, Paris, France.
Purpose:
Histoplasmosis due to Histoplasma capsulatum is a granulomatous fungic infection which appears opportunistic and disseminated in immunocompromised patients, especially among HIV patients in whom it can lead to death. Histoplasmosis is endemic in numerous areas worldwide, but in Europe most of the cases reported are imported. We describe the clinical features and the available diagnosis methods issued from our experience in French Guyana.
Methods:
Contamination occurs by inhalation of spores contained in dust. Most endemic areas are located on the American continent, including the French West Indies, where the incidence of histoplasmosis among HIV patients in French Guyana varies from 1.2 to 2.2% per year. In non-immunocompromised patients, histoplasmosis is asymptomatic most of the time. In HIV patients, the disseminated form is common and may occur many years after exposure to the fungus.
Results:
Non-specific symptoms, similar to those of either tuberculosis or other opportunistic infections, may reveal disseminated histoplasmosis in patients with AIDS. Early treatment (amphotericin B or itraconazole) is effective; however, it should be followed by a lifelong antifungic treatment (itraconazole) to prevent relapse.
Conclusion:
The infection should be suspected in any febrile HIV-infected patient with CD4 blood cell count < 200/mm3, if he/she ever travelled in an endemic zone. Direct examination of smear relating to clinical symptoms help guide diagnosis, while culture will confirm it after at least 4 weeks. Efficient serologic techniques for HIV-infected patients are not available in Europe.
Insights
Histoplasmosis is a fungal infection that affects immunocompromised individuals, particularly those with HIV. Early diagnosis and treatment are crucial for managing this opportunistic infection, especially in endemic areas.
Area of Science:
- Mycology
- Infectious Diseases
- Immunocompromised Host
Background:
- Histoplasmosis is a granulomatous fungal infection caused by Histoplasma capsulatum.
- It often presents as an opportunistic and disseminated disease in immunocompromised patients, especially those with HIV.
- While endemic globally, many European cases are imported.
Purpose of the Study:
- To describe the clinical features of histoplasmosis in French Guiana.
- To outline available diagnostic methods for histoplasmosis.
- To highlight the challenges in diagnosing histoplasmosis in HIV patients.
Main Methods:
- Contamination occurs via inhalation of fungal spores.
- Incidence in HIV patients in French Guiana ranges from 1.2-2.2% annually.
- Disseminated disease is common in HIV patients, potentially years after exposure.
Main Results:
- Disseminated histoplasmosis can present with non-specific symptoms mimicking tuberculosis or other opportunistic infections in AIDS patients.
- Early treatment with amphotericin B or itraconazole is effective.
- Lifelong itraconazole is necessary to prevent relapse.
Conclusions:
- Suspect histoplasmosis in febrile HIV patients (CD4 < 200/mm3) with travel history to endemic zones.
- Direct smear examination aids diagnosis; culture confirms within 4 weeks.
- Effective serologic tests for HIV patients are lacking in Europe.