Emergence of Echinocandin Resistance Due to a Point Mutation in the fks1 Gene of Aspergillus fumigatus in a Patient with Chronic Pulmonary Aspergillosis.

We have identified the first case of an fks1 hot spot 1 point mutation causing echinocandin resistance in a clinical Aspergillus fumigatus isolate recovered from a chronic pulmonary aspergillosis patient with an aspergilloma who first failed azole and polyene therapy and subsequently failed micafungin treatment.