Laboratory Medicine ›› 2024, Vol. 39 ›› Issue (12): 1150-1156.DOI: 10.3969/j.issn.1673-8640.2024.12.004

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Hospital and external environmental fungal screening and drug susceptibility analysis

LIU Ruiguang1, GUO Jian2()   

  1. 1. Department of Clinical Laboratory,Guiyang First People's Hospital,Guiyang 550001,Guizhou,China
    2. Department of Clinical Laboratory,Shanghai East Hospital,Tongji University,Shanghai 200120,China
  • Received:2024-04-27 Revised:2024-07-30 Online:2024-12-30 Published:2025-01-06

Abstract:

Objective To investigate the distribution and drug resistance characteristics of fungi in the external environments of hospitals,pastures,lakes,wetlands and oceans by culture omics,so as to provide a reference for the diagnosis and treatment of fungal infections in animals and humans. Methods Samples were collected from different environments,such as hospitals,pastures,lakes,wetlands and oceans. Based on the fungal culture omics,Sabouraud dextrose agar,CHROM Agar Candida and pan-fungal medium were used to culture the samples from different environments. The cultured fungi were identified by matrix-assisted laser desorption ionization time-of-flight mass spectrometry(MALDI-TOF MS),and the fungi that were rarely isolated in clinic were confirmed by internal transcribed spacer(ITS) sequencing analysis. Microbroth dilution method was used to determine fungal susceptibility. Results From 612 samples of different environments,327 isolates of fungi were isolated by co-culture,distributed in 72 different species. The highest isolation rate of yeast-like fungi was Candida krusei(11.01%,36/327),followed by Candida tropicalis(8.26%,27/327). The filamentous fungi were followed by Aspergillus fumigatus(7.65%,25/327),Aspergillus niger(6.12%,20/327) and Aspergillus flavus(2.75%,9/327). The yeast-like fungi,which were concerned in the diagnosis and treatment of clinical fungal infections,were also isolated,and these included Candida aurisCandida rugosaCandida lipolytica Candida catenulata and Candida membranaefaciens. The resistance rates of Candida tropicalis to posaconazole (66.67%),voriconazole (57.90%),fluconazole (52.63%) were high, and the resistance rate to echinocinins was 29.62%. The resistance rates of Candida membranaefaciens to voriconazole and micafungin were 33.33% and 66.67%,respectively. Conclusions There are differences in the distribution of fungi in different environments,and the environmental isolates have certain drug resistance. Among the yeast-like fungi,the isolation rate of Candida krusei is the highest,and partial yeast-like fungi have been determined as well. Among filamentous fungi,Aspergillus has a high isolation rate,mainly including Aspergillus fumigatusAspergillus niger and Aspergillus flavus. Affention should be paid to the prevention of fungal disenses,not limited to the hospital environmen.

Key words: Fungus, Environment, Candida krusei, Candida catenulata, Mass spectrometry identification

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