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DNA analysis in the study of fungal infections in the immunocompromised host
1Department of Medicine, Clinical Pathology William Beaumont Hospital, Royal Oak, Michigan, 48073, USA.
Abstract:
Fungal infections, most of which are caused by the Candida species, are an increasing problem in the immunocompromised host. The clinical manifestations of Candida infections include disseminated candidiasis, oral and esophageal infections, focal hepatic infections, peritoneal urinary tract infections, and wound infections. DNA methods, which include pulse field electrophoresis and restriction enzyme analysis of genomic DNA, have been used to increase understanding of the epidemiology of these infections. These techniques have shown that most Candida infections are endogenous or acquired from one's own flora. Recent outbreaks have provided evidence for exogenous acquisition of some isolates. Better methods for differentiation of colonization versus infection and identifying infection in the absence of positive cultures are under investigation.
Insights
Candida fungal infections are a growing concern for immunocompromised patients. DNA-based methods reveal most infections originate internally, though some are acquired externally.
Area of Science:
- Medical Mycology
- Infectious Diseases
- Molecular Epidemiology
Background:
- Fungal infections, primarily caused by Candida species, pose a significant threat to immunocompromised individuals.
- Clinical presentations of Candida infections are diverse, ranging from disseminated disease to localized infections in various organs and tissues.
- Understanding the origin and transmission of Candida infections is crucial for effective patient management.
Purpose of the Study:
- To summarize the current understanding of Candida infections in immunocompromised hosts.
- To review the application of DNA-based methods in studying the epidemiology of these infections.
- To highlight ongoing research for improved diagnostic strategies.
Main Methods:
- Review of clinical manifestations of Candida infections.
- Application of DNA-based techniques, including pulse field electrophoresis and restriction enzyme analysis, for epidemiological studies.
- Investigation into novel methods for differentiating colonization from infection and diagnosing infections without positive cultures.
Main Results:
- DNA methods indicate that most Candida infections are endogenous, originating from the host's own flora.
- Evidence suggests that exogenous acquisition of Candida isolates contributes to some outbreaks.
- Current diagnostic approaches are being refined to better distinguish between colonization and true infection.
Conclusions:
- Candida species are a major cause of opportunistic fungal infections, particularly in immunocompromised populations.
- Molecular epidemiology tools have elucidated the sources of infection, emphasizing both endogenous and exogenous routes.
- Further research is needed to develop advanced diagnostic tools for timely and accurate identification of invasive candidiasis.