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Wiener Medizinische Wochenschrift

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28.01.2020 | original article

Clonal dissemination of high-level gentamicin-resistant isolates of Enterococcus faecalis within a university hospital in southeastern Iran

verfasst von: Fereshteh Saffari, Hosein Darehkordi, Roya Ahmadrajabi

Erschienen in: Wiener Medizinische Wochenschrift | Ausgabe 1-2/2021

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Summary

Background

Combination of a cell wall-active antibiotic with an aminoglycoside confers a synergistic effect in the treatment of some severe enterococcal infections. Unfortunately, with the emergence of enterococci with high-level resistance to aminoglycosides, particularly to gentamicin, the efficacy of the synergistic combinations has decreased. In this study, high-level gentamicin-resistant (HLGR) isolates of enterococci and the diversity of the genes encoding aminoglycoside-modifying enzymes (AMEs) as well as putative clonal dissemination of HLGR isolates were investigated in a university hospital in southeastern Iran.

Methods

The minimum inhibitory concentration of gentamicin was determined and HLGR isolates were investigated for AME genes. Genetic similarity between isolates was analyzed using repetitive extragenic palindromic (rep)-Polymerase Chain Reaction (PCR) assay.

Results

Of 150 Enterococcus isolates, 62 isolates including Enterococcus faecalis (n = 46) and E. faecium (n = 16) were identified as HLGR. The most prevalent AME genes in both species were as follows: aph(3^′)-IIIa (n = 44), aac(6^′)-Ie-aph(2^′)-Ia (n = 36), and ant(4^′)-Ia (n = 15). The rep-PCR analysis showed clonality among E. faecalis isolates, so that 27 isolates were grouped in seven clusters representing similarity greater than 95%.

Conclusions

No link between AME determinants and clusters was found. Clonal spread of HLGR isolates of E. faecalis was found within our hospital. More rigorous recommendations are required to avoid dissemination of such resistant microorganisms in the hospital setting.

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Titel: Clonal dissemination of high-level gentamicin-resistant isolates of Enterococcus faecalis within a university hospital in southeastern Iran
verfasst von: Fereshteh Saffari
Hosein Darehkordi
Roya Ahmadrajabi
Publikationsdatum: 28.01.2020
Verlag: Springer Vienna
Erschienen in: Wiener Medizinische Wochenschrift / Ausgabe 1-2/2021
Print ISSN: 0043-5341
Elektronische ISSN: 1563-258X
DOI: https://doi.org/10.1007/s10354-019-00716-2

Springer Medizin Österreich

Summary

Background

Methods

Results

Conclusions

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