ID | 64355 |
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Nahar, Lutfun
Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
Hagiya, Hideharu
Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
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Nada, Takahiro
Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
Iio, Koji
Microbiology Division, Clinical Laboratory, Okayama University Hospital
Gotoh, Kazuyoshi
Department of Bacteriology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
Matsushita, Osamu
Department of Bacteriology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
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Otsuka, Fumio
Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
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Abstract | Inducible resistance to the macrolide, lincosamide, and streptogramin B (iMLSB) antibiotic family is a latent mechanism for antimicrobial resistance in Staphylococcus aureus. We here investigated the frequency and genotypic profiles of iMLSB resistance in clindamycin (CLDM)-susceptible S. aureus isolated in Okayama University Hospital from June 2020 to June 2021. We phenotypically screened the iMLSB resistance via D-zone test and performed PCR testing for the erythromycin ribosomal methylase (erm) genes: ermA and ermC. Among 432 CLDM-susceptible S. aureus isolates, 138 (31.9%) exhibited an iMLSB-resistance phenotype, with methicillinresistant S. aureus isolates (MRSA; 61 isolates: 58.6%) exhibiting higher positivity than methicillin-sensitive S. aureus isolates (MSSA; 77 isolates: 23.5%) (p<0.001). Male patients had a higher frequency of iMLSB resistance than females (OR [95%CI]: 1.8 [1.2-2.8]; p=0.007). Genotypically, ermA predominated in both MSSA (70.1%) and MRSA (86.9%) compared to ermC (14.3% in MSSA and 11.5% in MRSA). A single strain of MRSA possessed both ermA and ermC, while 12 (15.6%) MSSA isolates were negative for both ermA and ermC, suggesting the presence of other genetic mechanisms. Collectively, these results show that approximately 33% of CLDM-susceptible S. aureus isolates at our university hospital exhibited iMLSB resistance, predominantly caused by ermA in both MSSA and MRSA.
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Keywords | antimicrobial resistance
clindamycin
erm
D-zone test
inducible MLSB
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Amo Type | Original Article
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Publication Title |
Acta Medica Okayama
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Published Date | 2023-02
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Volume | volume77
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Issue | issue1
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Publisher | Okayama University Medical School
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Start Page | 1
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End Page | 9
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ISSN | 0386-300X
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NCID | AA00508441
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Content Type |
Journal Article
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language |
English
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Copyright Holders | Copyright Ⓒ 2023 by Okayama University Medical School
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File Version | publisher
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Refereed |
True
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