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Recent Patents on Anti-Infective Drug Discovery


ISSN (Print): 1574-891X
ISSN (Online): 2212-4071

General Research Article

Evaluation of Fosfomycin Activity Against Extended Spectrum Beta Lactamase (ESBL) Producing Enterobacteriaceae Isolated from Three Centers of Tehran, Iran

Author(s): Roya Ghanavati, Elnaz Ohadi, Hossein Kazemian, Fateme Yazdani, Alireza Torki, Behrooz S. Kalani and Gholamreza Irajian*

Volume 13, Issue 2, 2018

Page: [180 - 186] Pages: 7

DOI: 10.2174/1574891X13666180517075803

Price: $65


Background: Rising rates of antimicrobial resistance among Enterobacteriaceae limit the use of reliably active forms of available drugs. The aim of this study was to investigate the prevalence of fosfomycin (US6794490B2) resistance gene among ESBL producing isolates in Iran.

Method: We tested 355 isolates of Enterobacteriacea collected from various clinical samples including urine, wounds, blood and other sources during June 2016 to July 2017. Antibiotic sensitivity and Extended Spectrum Beta Lactamase (ESBL) production were tested using agar dilution method according to the Clinical and Laboratory Standards Institute (CLSI) guidelines. ESBL genes (blaTEM, bla SHV,bla CTX-M), plasmid-encoded fosfomycin resistance genes (fosA, fosB, fosA3 and fosC2) and chromosomal mutations (murA, glpT, uhpT) were detected by Polymerase Chain Reaction (PCR).

Results: In this study, 151 of the 355 isolates were ESBL-positive. blaCTX-M (77%) was the most common gene followed by blaSHV (70%) and blaTEM (58%), either alone or in combination. Eighty nine percent (132/151) of the ESBL-positive isolates were MDR. Antimicrobial susceptibility rates were higher for fosfomycin (92.8%) and imipenem (35.5%) among ESBL-positive isolates. None of the ESBL- positive isolates harbored any mutations or plasmid-mediated fosfomycin resistance determinants.

Conclusion: In conclusion, fosfomycin showed good antimicrobial activity against multidrug resistance ESBL- positive Enterobacteriaceae.

Keywords: Fosfomycin, ESBL, ESBL- positive Enterobacteriaceae, fos gene, phosphonic acid, infections.

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