B. Spruijtenburg , E. De Carolis , C. Magri , J.F. Meis , M. Sanguinetti , T. de Groot , E.F.J. Meijer
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引用次数: 0
Abstract
Objectives
Candida tropicalis is a medically important yeast with increasing antifungal resistance, but nosocomial transmission is rarely reported. This study genotyped C. tropicalis isolates from Italian hospitals to uncover potential nosocomial transmission and assess resistance.
Methods
In total, 197 C. tropicalis isolates from 161 patients were collected from five centres from 2013 to 2023. Short tandem repeat (STR) genotyping was conducted on all isolates, and a selection of 24 isolates were typed with whole-genome sequencing (WGS) and the novel Fourier-transform infrared (FTIR) spectroscopy method. Antifungal resistance was investigated with microbroth dilution and WGS.
Results
STR genotyping revealed seven clusters with isolates from multiple patients. WGS single nucleotide polymorphism (SNP) analysis on five groups of isolates with related STR genotypes also separated these isolates into five groups, of which two groups contained a cluster of isolates from different patients distinguished by ≤59 SNPs. In comparison, sequential isolates within three patients were differentiated by ≤141 SNPs. The two C. tropicalis WGS clusters also clustered based on FTIR genotyping, although this method did not separate the isolates into five groups. None of the 24 isolates were resistant to common antifungals.
Conclusions
WGS SNP analysis indicated nosocomial transmission of two lineages within the same hospital, highlighting the need for enforced infection prevention measures and routine genotyping on this common yeast in clinical settings. While both STR and FTIR genotyping also clustered these lineages, WGS SNP analysis is required to determine whether isolates were transmitted clonally.
期刊介绍：
The Journal of Hospital Infection is the editorially independent scientific publication of the Healthcare Infection Society. The aim of the Journal is to publish high quality research and information relating to infection prevention and control that is relevant to an international audience.
The Journal welcomes submissions that relate to all aspects of infection prevention and control in healthcare settings. This includes submissions that:
provide new insight into the epidemiology, surveillance, or prevention and control of healthcare-associated infections and antimicrobial resistance in healthcare settings;
provide new insight into cleaning, disinfection and decontamination;
provide new insight into the design of healthcare premises;
describe novel aspects of outbreaks of infection;
throw light on techniques for effective antimicrobial stewardship;
describe novel techniques (laboratory-based or point of care) for the detection of infection or antimicrobial resistance in the healthcare setting, particularly if these can be used to facilitate infection prevention and control;
improve understanding of the motivations of safe healthcare behaviour, or describe techniques for achieving behavioural and cultural change;
improve understanding of the use of IT systems in infection surveillance and prevention and control.
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