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Whole Genome Sequencing of Candida glabrata for Detection of Markers of Antifungal Drug Resistance
Published on: December 28, 2017
Resistance to antifungal agents in the critical care setting: problems and perspectives
1Center for Infectious Diseases, University of Texas Medical School-Houston 77030, USA.
Abstract:
As is the case with antibacterial agents, the increasing use of antifungal agents has led to development of antifungal resistance, the most clinically important of which is the resistance of Candida to fluconazole. While mutation to high-level fluconazole resistance is possible, the most important aspect of fluconazole resistance for patients in the ICU is the possibility of an epidemiologic shift away from such susceptible species as C. albicans and C. parapsilosis toward the most resistant species, such as C. glabrata and C. krusei. Resistance to amphotericin B by Candida is also possible, but less frequent. Strategies for treating invasive Candida infections must consider the relative rates of non-C. albicans Candida infection and the likelihood of antifungal resistance. The agents that cause invasive mold infections in the ICU are intrinsically moderately resistant to the available antifungal agents, and therapy depends less on the choice of antifungal therapy than on the correction of predisposing factors. The role of susceptibility testing as a guide in selecting appropriate therapy for all of these infections is as yet incompletely defined, but testing for resistance to fluconazole may soon be ready for clinical use.
Insights
Antifungal resistance in Candida species, particularly to fluconazole, is a growing concern, especially in ICUs. This resistance can lead to shifts in species prevalence, impacting treatment strategies for invasive fungal infections.
Area of Science:
- Medical Mycology
- Infectious Diseases
- Clinical Microbiology
Background:
- Increasing use of antifungal agents drives antifungal resistance, mirroring trends seen with antibacterials.
- Candida species resistance to fluconazole is clinically significant, impacting intensive care unit (ICU) patient management.
- Epidemiologic shifts towards more resistant Candida species (e.g., C. glabrata, C. krusei) are a key concern.
Purpose of the Study:
- To review the implications of antifungal resistance in invasive Candida infections within the ICU setting.
- To discuss treatment strategies considering species prevalence and resistance patterns.
- To evaluate the current and future role of antifungal susceptibility testing.
Main Methods:
- Review of current literature on antifungal resistance in Candida species.
- Analysis of clinical significance of resistance in ICU populations.
- Discussion of therapeutic approaches for invasive fungal infections.
Main Results:
- High-level fluconazole resistance in Candida is possible, but epidemiologic shifts to resistant species pose a greater clinical challenge.
- Resistance to amphotericin B in Candida is less common.
- Invasive mold infections in ICUs often involve intrinsically resistant agents, with therapy focusing on predisposing factors.
Conclusions:
- Treatment strategies for invasive Candida infections must account for non-albicans Candida prevalence and antifungal resistance.
- Antifungal susceptibility testing, particularly for fluconazole resistance, is evolving and may soon be clinically applicable.
- Management of invasive mold infections in ICUs is complex and often requires addressing underlying conditions.
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