Prospective multicentre study on azole resistance in Aspergillus isolates from surveillance cultures in haematological patients in Italy: Journal of Global Antimicrobial Resistance

A. Prigitano, M.C. Esposto, A. Grancini, M. Passera, M. Paolucci, M. Stanzani, A. Sartor, A. Candoni, L. Pitzurra, P. Innocenti, A. Micozzi, G.L. Cascio, M. Delia, A. Mosca, M. Mikulska, C. Ossi, C. Fontana, M. Pizzolante, M. Gelmi, C. CavannaF. Lallitto, G. Amato, A. Vella, L. Pagano, R. Bandettini, G. De Lorenzis, M. Cogliati, L. Romanò, A. Tortorano

Research output: Contribution to journalArticlepeer-review

Abstract

Objectives: This study was conducted to assess the prevalence of azole resistance in Aspergillus isolates from patients with haematological malignancies or who were undergoing haematopoietic stem cell transplantation and to identify the molecular mechanism of resistance. Methods: In this 28-month prospective study involving 18 Italian centres, Aspergillus isolates from surveillance cultures were collected and screened for azole resistance, and mutations in the cyp51A gene were identified. Resistant isolates were genotyped by microsatellite analysis, and the allelic profiles were compared with those of resistant environmental and clinical isolates from the same geographical area that had been previously genotyped. Results: There were 292 Aspergillus isolates collected from 228 patients. The isolates belonged mainly to the section Fumigati (45.9%), Nigri (20.9%), Flavi (16.8%) and Terrei (4.8%). Three isolates showed itraconazole resistance: Aspergillus fumigatus sensu stricto, Aspergillus lentulus (section Fumigati) and Aspergillus awamori (section Nigri). The itraconazole resistance rates were 1% and 1.48% considering all Aspergillus spp. isolates and the Aspergillus section Fumigati, respectively. The prevalence of azole resistance among all the patients was 1.3%. Among patients harbouring A. fumigatus sensu stricto isolates, the resistance rate was 0.79%. The A. fumigatus isolate, with the TR34/L98H mutation, was genotypically distant from the environmental and clinical strains previously genotyped. Conclusions: In this study, the Aspergillus azole resistance rate was 1% (3/292). In addition to A. fumigatus sensu stricto, A. lentulus and A. awamori azole-resistant isolates were identified. Therefore, it is important have a correct identification at the species level to address a rapid therapy better, quickly understand the shift towards cryptic species and have an updated knowledge of the local epidemiology. © 2020 The Author(s)
Original languageEnglish
Pages (from-to)231-237
Number of pages7
JournalJ. Global Antimicrob. Resist.
Volume22
DOIs
Publication statusPublished - 2020

Keywords

  • Aspergillus spp.
  • Azole resistance
  • Haematological
  • Haematopoietic stem cell transplantation
  • amphotericin B lipid complex
  • echinocandin
  • itraconazole
  • posaconazole
  • voriconazole
  • acute lymphoblastic leukemia
  • acute myeloid leukemia
  • adolescent
  • adult
  • antifungal resistance
  • Article
  • Aspergillus
  • Aspergillus awamori
  • Aspergillus fumigatus
  • Aspergillus lentulus
  • autologous hematopoietic stem cell transplantation
  • child
  • chronic lymphatic leukemia
  • chronic myeloid leukemia
  • cohort analysis
  • controlled study
  • cyp51A gene
  • drug screening
  • female
  • fungal gene
  • fungus growth
  • fungus isolation
  • genotype
  • hairy cell leukemia
  • hematologic malignancy
  • human
  • Italy
  • major clinical study
  • male
  • minimum inhibitory concentration
  • multicenter study
  • multiple myeloma
  • prevalence
  • priority journal
  • prospective study

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