Characterization of glycopeptides, aminoglycosides and macrolide resistance among Enterococcus faecalis and Enterococcus faecium isolates from hospitals in Tehran.
The prevalence of glycopeptides, aminoglycosides and erythromycin resistance among Enterococcus faecalis and Enterococcus faecium was investigated. The susceptibility of 326 enterococcal hospital isolates to amikacin, kanamycin, netilmicin and tobramycin were determined using disk diffusion method. The minimum inhibitory concentration (MIC) of vancomycin, teicoplanin, gentamicin, streptomycin, and erythromycin were determined by microbroth dilution method. The genes encoding aminoglycoside modifying enzymes described as AMEs genes, erythromycin-resistant methylase (erm) and vancomycin-resistant were targeted by multiplex-PCR reaction. High level resistance (HLR) to gentamicin and streptomycin among enterococci isolates were 52% and 72% respectively. The most prevalent of AMEs genes were aac (6')-Ie aph (2") (63%) followed by aph (3')-IIIa (37%). The erythromycin resistance was 45% and 41% of isolates were positive for ermB gene. The ermA gene was found in 5% of isolates whereas the ermC gene was not detected in any isolates. The prevalence of vancomycin resistant enterococci (VRE) was 12% consisting of E. faecalis (6%) and E. faecium (22%) and all of them were VanA Phenotype. The results demonstrated that AMEs, erm and van genes are common in enterococci isolated in Tehran. Furthermore our results show an increase in the rate of vancomycin resistance among enterococci isolates in Iran.
Emaneini
Mohammad
M
Department of Microbiology, School of Medicine/Medical Sciences. University of Tehran, Tehran, Iran. emaneini@hotmail.com
Aligholi
Marzieh
M
Aminshahi
Maneli
M
D000123:Acetyltransferases / Q000235:genetics; D001426:Bacterial Proteins / Q000235:genetics; D019729:Carbon-Oxygen Ligases / Q000235:genetics; D003428:Cross Infection / Q000453:epidemiology; D052978:Disk Diffusion Antimicrobial Tests; D024881:Drug Resistance, Bacterial; D013293:Enterococcus faecalis / Q000187:drug effects / Q000201:enzymology / Q000235:genetics*; D016984:Enterococcus faecium / Q000187:drug effects / Q000201:enzymology / Q000235:genetics*; D004917:Erythromycin / Q000494:pharmacology; D005798:Genes, Bacterial; D005839:Gentamicins / Q000494:pharmacology; D006801:Humans; D007492:Iran / Q000453:epidemiology; D019868:Kanamycin Kinase / Q000235:genetics; D008780:Methyltransferases / Q000235:genetics; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000235:genetics; D014640:Vancomycin / Q000494:pharmacology; D020713:Vancomycin Resistance
D001426:Bacterial Proteins; D005839:Gentamicins; C071437:VanA ligase, Bacteria; D004917:Erythromycin; D014640:Vancomycin; C108453:6'-aminoglycoside acetyltransferase-2''-aminoglycoside phosphotransferase; D008780:Methyltransferases; C431709:ErmA protein, Bacteria; D000123:Acetyltransferases; D017853:Phosphotransferases (Alcohol Group Acceptor); D019868:Kanamycin Kinase; D019729:Carbon-Oxygen Ligases