Antifungal resistance is an important cause of treatment failure.
Breakpoints & susceptibility testing
Resistance can be either MICROBIOLOGICAL (intrinsic resistance or acquired ie presence of a resistance mutation) or CLINICAL (treatment failure). Examples of intrinsic resistance include: Aspergillus and fluconazole, Candida krusei and Aspergillus terreus and amphotericin B, Cryptococcus and Mucorales and echinocandins.
Empirical antifungal therapy and prophylaxis save lives, but may be associated with the development of antifungal resistance.
Candida parapsilosis Y132F (Choi et al, 2018)
A free online course is available via FutureLearn, : Role of Antifungal Stewardship
The cornerstones of an antifungal stewardship programme are:
- Rapid diagnostics, including susceptibility testing
- Targeted (i.e. not empirical) prescribing of antifungals
- Check whether your hospital includes antifungals in its site-wide antibiogram