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Molecular epidemiology and clinical significance of Corynebacterium striatum isolated from clinical specimens

Authors
Suh, Jin WoongJu, YonggukLee, Chang KyuSohn, Jang WookKim, Min JaKyung Yoon, Young
Issue Date
2019
Publisher
DOVE MEDICAL PRESS LTD
Keywords
Corynebacterium striatum; multidrug resistant; multilocus sequence typing; opportunistic infections; nosocomial infections
Citation
INFECTION AND DRUG RESISTANCE, v.12, pp.161 - 171
Indexed
SCIE
SCOPUS
Journal Title
INFECTION AND DRUG RESISTANCE
Volume
12
Start Page
161
End Page
171
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/69002
DOI
10.2147/IDR.S184518
ISSN
1178-6973
Abstract
Purpose: This study investigated the clinical epidemiology, antimicrobial susceptibility, and molecular epidemiology of Corynebacterium striatum isolates. Patients and methods: An observational study was conducted at a university hospital in the Republic of Korea from August to December 2016. All subjects were patients who tested positive for C. striatum clinically. Clinical data were analyzed to evaluate the microbiological and genotypic characteristics of C. striatum strains. Results: Sixty-seven C. striatum isolates recovered from non-duplicated patients were characterized. Patients were classified into three groups according to the infection type: nosocomial infection (71.6%), health care-associated infection (8.7%), and community-acquired infection (18.8%). The most common clinical specimens were urine (35.8%) and skin abscesses (32.8%). Fifty-two (77.6%) isolates showed multidrug resistance, defined as resistance to >= 3 different antibiotic families. All strains were susceptible to vancomycin and linezolid. Resistance to other antibiotics varied: penicillin (n=65; 97.0%), ampicillin (n=63; 94.0%), cefotaxime (n=64; 95.5%), and levofloxacin (n=61; 91.0%). Phylogenetic analysis identified all 16 S rRNA gene sequences of the 67 isolates as those of C. striatum, where 98%-99% were homologous to C. striatum ATCC 6940. In multilocus sequence typing for internal transcribed spacer region, gyrA, and rpoB sequencing, the most predominant sequence types (STs) were ST2, ST3, ST6, and ST5. Conclusion: C. striatum isolates may cause opportunistic infections associated with nosocomial infections through horizontal transmission. The presence of multidrug resistance and intra-hospital dissemination implicate C. striatum isolates as a potential target pathogen for infection control and antimicrobial stewardship programs.
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