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Opportunistic and pathogenic fungi
1Medical Mycology Unit, University of Glasgow, UK.
Abstract:
The number of fungal species reported to cause disease in man is increasing rapidly. Very few of these fungi are capable of infecting a normal host. Important progress has been achieved in an understanding of fungal pathogenicity including the mechanisms of adherence to host tissues, penetration of tissues, multiplication within the host, and the interaction of fungal cells with host effector cells. In addition to the increase in infections by opportunistic and pathogenic fungi in compromised patients, caused by Candida spp., Aspergillus spp., Cryptococcus neoformans, Histoplasma capsulatum and Coccidioides immitis, many fungi that occur as saprophytes in the environment and which had previously been considered to be nonpathogenic are now being encountered as causes of human infection. The advent of these unusual infections has led to reappraisal of the diagnostic tests involved in the investigation of fungal infections and has had important implications for the choice of treatment. Many of these fungi have a similar tissue appearance and the organisms must be isolated and identified to ensure that the most appropriate treatment is given.
Insights
Human fungal infections are rising, including from environmental fungi previously thought harmless. Understanding fungal pathogenicity and accurate identification are crucial for effective treatment strategies.
Area of Science:
- Medical Mycology
- Infectious Diseases
- Pathogen Biology
Background:
- The incidence of human fungal infections is rapidly increasing.
- Many emerging fungal pathogens were previously considered nonpathogenic environmental saprophytes.
- Opportunistic fungal infections are common in immunocompromised individuals.
Purpose of the Study:
- To review the mechanisms of fungal pathogenicity.
- To highlight the challenges posed by emerging fungal infections.
- To emphasize the importance of accurate fungal identification for treatment.
Main Methods:
- Review of current literature on fungal pathogenicity mechanisms.
- Analysis of trends in human fungal infections.
- Discussion of diagnostic and therapeutic implications.
Main Results:
- Significant advancements in understanding fungal adherence, tissue penetration, and host-pathogen interactions.
- Identification of an increasing number of environmental fungi causing human disease.
- Recognition of diagnostic challenges due to similar tissue morphology of various fungi.
Conclusions:
- Accurate isolation and identification of fungal species are essential for appropriate treatment selection.
- The rise of unusual fungal infections necessitates a re-evaluation of diagnostic approaches.
- Further research into fungal pathogenicity is critical for managing emerging infectious diseases.