High-Level Aminoglycoside Resistance in Enterococcus Faecalis and Enterococcus Faecium; As a Serious Threat in Hospitals Publisher Pubmed



Khodabandeh M¹ ; Mohammadi M² ; Abdolsalehi MR¹ ; Hasannejadbibalan M³ ; Gholami M⁴ ; Alvandimanesh A⁵ ; Pournajaf A⁶ ; Rajabnia R⁷
Source: Infectious Disorders - Drug Targets Published:2020

Abstract

Aims and Objectives: The present work aimed to evaluate the frequency of aminogly-coside-modifying enzymes encoding genes in the E. faecalis and E. faecium and their antibiotic resistance profile. Methods: A total of 305 different clinical samples were subjected for identification and antibiotic susceptibility test. The high-level aminoglycoside resistance was identified by MIC and Kirby Bauer disc diffusion method. The prevalence of aac (6')-Ie-aph (2'')-Ia, aph (3')-IIIa and ant (4')-Ia genes was determined by multiplex-PCR. In total, 100 enterococci strains were isolated. The prevalence of E. faecalis and E. faecium isolates was 78% and 22%, respectively. Results: All isolates were susceptible to linezolid. So, all E. faecalis were susceptible to vanco-mycin but, 36.4% of E. faecium were resistant to it. The prevalence of multiple drug resistance strains was 100% and 67.9% of E. faecium and E. faecalis, respectively. High-level-gentamicin and streptomycin resistant rates were as follows; 26.9% and 73.1% of E. faecalis and 77.3% and 90.1% of E. faecium. Conclucion: The results of the current study showed a high frequency of aac (6')-Ie-aph (2'')-Ia genes among enterococcal isolates. A high rate of resistance to antimicrobials in Enterococcus is obviously problematic, and a novel policy is needed to decrease resistance in these microorganisms. © 2020 Bentham Science Publishers.