In vitro Activity of Fosfomycin against Multidrug-Resistant Urinary and Nonurinary Gram-Negative Isolates
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Updated: Feb 6, 2026

Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria
Published on: September 16, 2013
Bijayini Behera1, Srujana Mohanty1, Subhrajyoti Sahu1
1Department of Microbiology, All India Institute of Medical Sciences, Bhubaneswar, Odisha, India.
Background:
The era of multidrug-resistant (MDR) Gram-negative bacilli (GNB) has renewed interest in fosfomycin.
Aim:
The present study evaluated the in vitro activity of fosfomycin against MDR urinary and nonurinary GNB isolates.
Materials And Methods:
Fosfomycin susceptibility was carried out by agar dilution for a total of 279 (142 from urine and 137 from other samples) MDR-GNB. Disk diffusion was done for urinary isolates only.
Results:
Urinary tract isolates had a high degree of susceptibility to fosfomycin (overall susceptibility, 90.8%), whereas only 42.9% of nonurinary isolates retained susceptibility to the drug. Percentage susceptibility rates for urinary and nonurinary isolates of Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, and Acinetobacter spp. were 99%, 91.3%, 66%, 0% and 62%, 44.4%, 32%, 11%, respectively.
Conclusion:
Fosfomycin showed excellent in vitro activity for uropathogens. Large-scale evaluation of fosfomycin against MDR systemic isolates is required to evaluate its therapeutic efficacy.
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