Abstract:
:Aspergillus fumigatus is the leading cause of mortality in severely immunocompromised individuals. Understanding pathogen dispersion and relatedness is essential for determining the epidemiology of nosocomial infections. Therefore, the aim of this study was to investigate the diversity and putative origins of clinical and environmental azole-susceptible and -resistant A. fumigatus isolates from Iran. In all, 79 isolates, including 64 azole-susceptible and 15 -resistant isolates, were genotyped using the cell surface protein (CSP) gene. Seven distinct repeat types (r01, r02, r03, r04, r05, r06 and r07) and 11 different CSP variants (t01, t02, t03, t04A, t06A, t06B, t08, t10, t18A, t18B and t22) were observed. Interestingly, t06B, t18A and t18B were exclusively present in azole-resistant isolates. The Simpson's index of diversity (D) was calculated at 0.78. Resistant isolates were genetically less diverse than azole-susceptible isolates. However, azole-resistant A. fumigatus without TR34 /L98H were more diverse than with TR34 /L98H. The limited CSP type diversity of the TR34 /L98H isolates versus azole-susceptible isolates suggests that repeated independent emergence of the TR34 /L98H mechanism is unlikely. It has been suggested that CSP types might have a common ancestor that developed locally and subsequently migrated worldwide.
journal_name
Mycosesjournal_title
Mycosesauthors
Falahatinejad M,Vaezi A,Fakhim H,Abastabar M,Shokohi T,Zahedi N,Ansari S,Meis JF,Badali Hdoi
10.1111/myc.12717subject
Has Abstractpub_date
2018-02-01 00:00:00pages
143-147issue
2eissn
0933-7407issn
1439-0507journal_volume
61pub_type
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