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Fungal infections in AIDS. Cryptococcosis
1Infectious Disease Service, Memorial Sloan-Kettering Cancer Center, New York, New York.
Abstract:
Cryptococcus neoformans, Histoplasma capsulatum, and Coccidioides immitis are the three fungi that regularly cause disseminated, life-threatening disease in patients with AIDS. Cryptococcosis is the fourth most common opportunistic infection in patients with AIDS and results in meningitis or pneumonia or both, in most cases. In addition, there have been unusual focal infections described and even unexplained fever alone. In any patient at risk for HIV infection, routine screening tests should include serum cryptococcal antigens, and this test should be repeated whenever new symptoms or signs appear. Once the diagnosis is established, treatment with amphotericin B is mandatory and a response should be expected. The necessity for combination therapy with flucytosine has not been documented. When the disease is under control and a course of 1 to 2 gm of amphotericin B has been administered, a maintenance suppressive regimen using amphotericin B at least weekly must be given. Oral azole regimens, such as ketoconazole or fluconazole, are under study and offer promise of a more easily managed maintenance program.
Insights
Routine screening for cryptococcal antigens is vital for patients at risk of HIV infection. Early diagnosis and mandatory amphotericin B treatment are crucial for managing cryptococcosis, a common AIDS-related fungal infection.
Area of Science:
- Mycology
- Infectious Diseases
- Immunology
Background:
- Cryptococcus neoformans, Histoplasma capsulatum, and Coccidioides immitis are key fungal pathogens causing severe disseminated disease in AIDS patients.
- Cryptococcosis is the fourth most common opportunistic infection in AIDS, frequently presenting as meningitis or pneumonia.
- Unusual presentations include focal infections and unexplained fever in individuals with HIV.
Purpose of the Study:
- To highlight the importance of routine serum cryptococcal antigen screening in patients at risk for HIV.
- To outline the recommended diagnostic and treatment protocols for cryptococcosis in AIDS patients.
- To discuss the role of maintenance suppressive therapy and emerging oral azole regimens.
Main Methods:
- Routine serum cryptococcal antigen screening for at-risk patients.
- Diagnostic confirmation of cryptococcosis.
- Treatment initiation with amphotericin B.
- Monitoring for treatment response and implementation of maintenance therapy.
Main Results:
- Serum cryptococcal antigen testing is a critical screening tool.
- Amphotericin B is the mandatory initial treatment for established cryptococcosis.
- Maintenance suppressive therapy with amphotericin B is necessary after initial treatment.
- Oral azole antifungals show promise for long-term management.
Conclusions:
- Early detection and prompt treatment of cryptococcosis are essential for managing AIDS patients.
- Amphotericin B remains the cornerstone of initial therapy, followed by suppressive regimens.
- Further research into oral azole maintenance therapy is warranted for improved patient management.