Current status of antifungal resistance and its impact on clinical practice

Laura Alcazar-Fuoli1, Emilia Mellado

  • 1Mycology Reference Laboratory, Centro Nacional de Microbiologia, Instituto de Salud Carlos III, Madrid, Spain.

Insights

Invasive fungal diseases cause high mortality. Understanding antifungal resistance in emerging fungal pathogens is crucial for effective treatment strategies and improving patient outcomes.

Area of Science:

  • Medical Mycology
  • Infectious Diseases
  • Antimicrobial Resistance

Background:

  • Invasive fungal diseases (IFDs) continue to have high mortality rates despite advances in antifungal therapies.
  • Candida albicans and Aspergillus fumigatus are primary causes of IFDs, but non-albicans Candida species and emerging filamentous fungi are increasingly problematic, especially in immunocompromised individuals.
  • Emerging fungal pathogens often exhibit resistance to existing antifungals, complicating treatment and increasing mortality.

Purpose of the Study:

  • To review the current epidemiology of antifungal resistance in pathogenic fungi.
  • To emphasize the molecular mechanisms underlying antifungal resistance.
  • To provide insights for optimizing antifungal therapy effectiveness.

Main Methods:

  • Review of current literature on antifungal resistance epidemiology.
  • Analysis of molecular mechanisms of antifungal resistance in key fungal species.
  • Evaluation of antifungal susceptibility testing methods for detecting resistance patterns.

Main Results:

  • Antifungal resistance is a growing challenge in managing invasive fungal infections.
  • Molecular characterization reveals diverse resistance mechanisms in pathogenic fungi.
  • Antifungal susceptibility testing is vital for identifying emerging resistance.

Conclusions:

  • Effective management of IFDs requires a deep understanding of antifungal resistance patterns and mechanisms.
  • Continued research into molecular resistance mechanisms is essential for developing new therapeutic strategies.
  • Optimizing antifungal therapy relies on accurate susceptibility testing and knowledge of resistance epidemiology.

Related Concept Videos

Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within...
90
Antifungal Agents01:15

Antifungal Agents

Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to...
119
Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
2.3K
Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism of Antibiotic Resistance in MRSA

Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and...
219
Development of Antibiotic Resistance01:30

Development of Antibiotic Resistance

Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
2.0K
Therapeutic Drug Monitoring: Affecting Factors01:29

Therapeutic Drug Monitoring: Affecting Factors

Therapeutic Drug Monitoring (TDM) is the clinical practice of measuring specific drug levels in a patient's blood or body tissues to manage and optimize therapy. TDM is crucial for drugs with narrow therapeutic windows, like warfarin and phenytoin, where incorrect doses can lead to treatment failure or severe side effects. This monitoring ensures the dosage administered is within a safe and effective range. The factors affecting therapeutic drug monitoring include:Patient-Specific Factors:a.
429