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[Epidemiology of deep-seated, domestic mycoses]
1Sektion Mykologie, Albert-Ludwigs-Universität Freiburg i. Br., BR Deutschland.
Abstract:
The opportunistic character of deep-seated mycoses depends on granulocyte-based defense in candidosis and aspergillosis. Therefore, haematological, patients represent the group of highest risk. Mucocutaneous candidosis is controlled by macrophages. Cryptococcus neoformans forces its way into the human host via causing an imbalance in the CD8-T-cell suppressor system. An aggravating synergism exists between Cryptococcus invasion and HIV-infection which explains the severe course of cryptococcosis in AIDS patients. The following pathways of transmission are observed in opportunistic mycoses: In aspergillosis and cryptococcosis humans are infected by inhalation of fungal propagules and primary settlement of the pathogens in the lungs, a site from which dissemination may occur. Exposure to Aspergillus conidiospores is ubiquitous and can be remarkably intensified by construction activities. Exposure to Cr. neoformans is geographically highly variable; not all humans are exposed. Candidosis emerges from the commensal reservoir of the human gastrointestinal tract, caused by translocation of the pathogens from the GI tract into the blood-lymph circulation or by anal/oral or oral-oral infection respectively. The incidence of deep-seated mycoses in the northern hemisphere is estimated to be 600 mycosis situations per million population per year. The estimate for Germany amounts to 50,000 mycoses patients per year, i.e. 45,000 candidosis and 5,000 aspergillosis situations as well as 100 each of cryptococcal and other mycotic diseases. Beyond that the number of AIDS-patients with cryptococcosis in Germany amounts to about 200 cases.
Insights
Opportunistic fungal infections like candidosis, aspergillosis, and cryptococcosis pose risks, particularly for immunocompromised individuals. Understanding transmission routes and host defenses is crucial for managing these deep-seated mycoses.
Area of Science:
- Medical Mycology
- Immunology
- Infectious Diseases
Context:
- Deep-seated mycoses (fungal infections) are opportunistic, affecting individuals with compromised immune systems.
- Hematological patients are at high risk due to impaired granulocyte defenses against candidosis and aspergillosis.
- HIV infection exacerbates cryptococcosis, leading to severe illness in AIDS patients.
Purpose:
- To elucidate the immunological basis and transmission pathways of opportunistic mycoses.
- To highlight the specific vulnerabilities in patients with hematological disorders and HIV/AIDS.
- To provide epidemiological data on the incidence of mycoses in Germany.
Summary:
- Opportunistic mycoses depend on host immune status; candidosis and aspergillosis are linked to granulocyte function, while cryptococcosis involves CD8-T-cell imbalance, worsened by HIV.
- Transmission occurs via inhalation (aspergillosis, cryptococcosis) or translocation from the gastrointestinal tract (candidosis).
- Estimated incidence in the Northern Hemisphere is 600 cases per million annually, with Germany reporting 50,000 cases yearly, including significant numbers of candidosis and aspergillosis.
Impact:
- Informed clinical management strategies for at-risk patient populations.
- Enhanced understanding of fungal pathogenesis and host-pathogen interactions.
- Data supports public health initiatives and resource allocation for mycosis prevention and treatment.