期刊名称：Environmental Health Engineering and Management
印刷版ISSN：2423-3765
电子版ISSN：2423-4311
出版年度：2015
卷号：2
期号：4
页码：199-202
语种：English
出版社：Kerman University of Medical Sciences
摘要：Background: Enterococci have emerged as a major cause of nosocomial infections and within this group,Enterococcus faecalis and Enterococcus faecium cause the majority of human and livestock enterococcal infections. In this article,we tried to determine antibiotics and metals resistance patterns of E. faecalis and E. faecium strains. Methods: One hundred sixty different strains of E. faecalis and E. faecium were collected from livestock sewage and the human fecal waste during 15 months. Then bacterial antibiotics sensitivity tests were carried out using the Agar disc diffusion method. Results: Generally,100% of E. faecalis strains separated from human and livestock sources (i.e. sheep) showed penicillin (P)/ kanamycin (K)/ nitrofurantoin (N)/ loracarbef (L)/ Ciprofloxacin (Cc)/ ampicillin (AN)/ nalidixic acid (NA)/ sulfamethoxazole (S) antibiotics resistance patterns. In addition,55% of isolated E. faecium showed P/S/AN/NA antibiotics resistance patterns. Each strain showed a resistance to at least two aminoglycoside antibiotics. However,E. faecalis strains from human and the livestock sources showed 94% and 100% of resistance to nitrofurantoin,respectively. The effects of different metal concentrations was evaluated in both strains. The agar dilution method was applied in this stage. Hg at 0.05 mmol/L of minimum inhibitory concentration (MIC) showed toxicity to both the human and livestock Enterococcus strains. Cadmium at 1 mmol/L and 0.5 mmol/L concentrations had the most toxicity to E. faecalis and E. faecium strains,respectively. Obviously,toxicity to bacteria is less than other metals. As a result,Zn/Ni/Cu/Co resistance pattern is suggested for both strains. Finally,antibiotics and heavy metals resistance patterns were monitored simultaneously. Conclusion: Almost all E. faecalis strains isolated from humans and livestock showed antibiotics and heavy metals resistance patterns of P/K/L/Cc/S/AN/NA/Zn/Cu/Co simultaneously. Moreover,55% of E. faecium strains showed similar antibiotics and heavy metals resistance patterns of P/S/AN/NA/Zn/Ni/Cu/Co..
关键词：E. faecalis; Heavy metals; Antibiotics; Resistance
