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Year : 2017  |  Volume : 33  |  Issue : 2  |  Page : 149-154

Fosfomycin susceptibility among multidrug-resistant, extended-spectrum beta-lactamase-producing, carbapenem-resistant uropathogens

1 Department of Microbiology, ESIC Medical College and ESIC Hospital and ODC (EZ), Joka, Kolkata, West Bengal, India
2 Student, ESIC Medical College and ESIC Hospital and ODC (EZ), Joka, Kolkata, West Bengal, India

Date of Submission22-Aug-2016
Date of Acceptance27-Jan-2016
Date of Web Publication30-Mar-2017

Correspondence Address:
Sayantan Banerjee
Department of Microbiology, ESIC Medical College and ESIC Hospital and ODC (EZ), Joka, Kolkata, West Bengal
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/iju.IJU_285_16

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Introduction: Urinary tract infection (UTI) is one of the most common infectious diseases. With the emergence of multidrug resistance (MDR), therapeutic options for treatment of UTIs are becoming limited. Fosfomycin has emerged as a novel oral therapeutic option with bactericidal activity against the MDR uropathogens. We evaluated the susceptibility pattern of uropathogens to this antibiotic.
Methods: A prospective study was conducted for 6 months in a tertiary care hospital in Eastern India to evaluate whether the common uropathogens were susceptible to fosfomycin. Identification of organisms causing significant bacteriuria was done by conventional biochemical and VITEK 2 Compact System™. Antimicrobial susceptibility testing was performed against these pathogens by Kirby-Bauer disc diffusion method. Minimum inhibitory concentrations were measured for certain drugs by E-strips and VITEK 2 Compact System.
Results: A total of 2229 urine samples were referred for culture during the study period, which yielded 356 significant bacterial isolates. Among these isolates, 64.78% were extended-spectrum beta-lactamases producers, 15.97% were carbapenem-resistant Enterobacteriaceae, and 42.7% isolates were found to be MDR Enterobacteriaceae (MDRE). However, 95.18% of the total isolates and 95.93% of MDRE were found to be susceptible to fosfomycin.
Conclusion: The common uropathogens, including MDR isolates, show high in vitro susceptibility to fosfomycin, which therefore has the potential to emerge as a promising alternative oral agent for outpatient therapy of UTIs.

How to cite this article:
Banerjee S, Sengupta M, Sarker TK. Fosfomycin susceptibility among multidrug-resistant, extended-spectrum beta-lactamase-producing, carbapenem-resistant uropathogens. Indian J Urol 2017;33:149-54

How to cite this URL:
Banerjee S, Sengupta M, Sarker TK. Fosfomycin susceptibility among multidrug-resistant, extended-spectrum beta-lactamase-producing, carbapenem-resistant uropathogens. Indian J Urol [serial online] 2017 [cited 2023 Mar 25];33:149-54. Available from:

   Introduction Top

Urinary tract infection (UTI) is one of the most common clinical entities encountered by the medical practitioners. The most common organisms causing UTI are all known to harbor multiple drug resistance (MDR) mechanisms, both inherited or transmissible and chromosomal or extrachromosomal against the commonly used oral antimicrobial agents for UTI caused by Gram-negative organisms, i.e., fluoroquinolones, trimethoprim-sulfamethoxazole, nitrofurantoin, and second and third-generation cephalosporins.[1] With rampant overuse and abuse of these drugs, particularly in the developing countries like India with availability of over the counter drugs, Gram-negative organisms have become overwhelmingly resistant to all or most of these agents, making outpatient oral therapy increasingly difficult.

Extended spectrum beta-lactamase (ESBL) production is common among clinical isolates of Enterobacteriaceae. Since carbapenems are considered drug of choice for serious infections caused by these microorganisms, use of these drugs is increasing, which is contributing to the selection and spread of carbapenem-resistant Gram-negative bacilli.[2] Various definitions are given for MDR organisms. The most commonly used definition is bacteria which is resistant to three or more antimicrobial classes.[3]

Fosfomycin is an oral antibiotic with bactericidal activity against these MDR pathogens. It inhibits synthesis of the bacterial cell wall.[4] It is best absorbed if given before food intake and is excreted in urine.[5] It achieves high concentration in urine of 2000 μg/ml and maintains high levels for over 24 h.[6] Hence, single-time oral therapy with fosfomycin has been recommended in uncomplicated UTI.[7]

This study was done with the objective to determine in vitro fosfomycin susceptibility of common uropathogens and determining the resistance pattern of these organisms against commonly prescribed antimicrobial agents.

   Methods Top

A prospective study was conducted from November, 2015, to April, 2016 in the Department of Microbiology in a 380 bedded tertiary care hospital and medical college in Eastern India. Urine samples were collected from patients who had clinical features suggestive of UTI from the inpatients and outpatients departments. Freshly collected mid-stream clean catch urine samples were collected from the non-catheterized, alert, conscious, adult patients with indications for urine culture as assessed by the clinicians from the various departments.[8] Surgically collected urine samples and suprapubic aspirates were collected from some patients as indicated. If the patients were catheterized; then, urine samples were collected from the catheter with proper surgical asepsis with needle and syringe as described in erstwhile standard technique guidelines.[9]

The urine samples were processed immediately (within 30 min) after collection. Direct microscopy of the uncentrifuged urine sample was done, and pus cells and bacteria were noted. Centrifuged deposits were examined under microscope for the casts and crystals. The urine samples were plated by semi-quantitative method on blood agar and MacConkey agar and incubated at 37°C overnight and if required, till 48 h. The growth of organisms and colony count were taken. The isolates obtained from the samples with significant bacteriuria in the background of relevant supportive clinical features of UTI and/or the presence of significant pus cells on direct microscopy, as described in the standard guidelines, were only included in the study.[1]

The identification of the organism was done by conventional biochemical tests and VITEK 2 Compact System (BioMérieux Inc., France). The antimicrobial susceptibility was performed for these isolates on Mueller-Hinton agar plates by Kirby-Bauer disc diffusion method and interpreted according to the Clinical and Laboratory Standards Institute guidelines M100-S25 version published in 2015.[10] The different antimicrobial agents that were tested for different organisms are given in [Table 1]. For Enterobacteriaceae other than E. coli, minimum inhibitory concentration (MIC) testing was done for fosfomycin by E-test for confirmation, and interpretation was done according to EUCAST guidelines 2015 as given by Falagas et al.[4] As per the previously published guidelines, cefazolin susceptibility can be used to predict the susceptibility toward all oral cephalosporins when used for treating uncomplicated UTIs caused by E. coli, Klebsiella spp., and Proteus mirabilis.[10] For detection of ESBL producers, screening was done using disc diffusion method with ceftriaxone and cefotaxime, and confirmation was done by simultaneous testing with cefotaxime (30 μg) and combination of cefotaxime/clavulanate (30/10 μg) by disc diffusion method. Modified Hodge test was done for the confirmation of the carbapenem-resistant Enterobacteriaceae.[10]
Table 1: The different antimicrobial agents tested for susceptibility

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MDR Enterobacteriaceae (MDRE) are the organisms resistant to any three different classes of antibiotics as defined by the previous guidelines.[3] In our study, it includes resistance to any three of the following groups - cephalosporins, fluoroquinolones, aminoglycosides, folate pathway inhibitors (trimethoprim-sulfamethoxazole), and nitrofurantoin.

   Results Top

A total of 2229 urine samples were received fulfilling the inclusion criteria. Among these, 345 samples showed growth of significant colony count of one or two organisms, yielding a sum of 356 isolates fulfilling the criteria for significance.

Of these 345 patients with significant growth of organisms, 92 (26.67%) were male and 253 (73.33%) were female. 16 (4.63%) were children below 12 years of age. Out of the positive isolates, 147 were from OPD, 206 from inpatient wards, and 3 from the ICU [Table 2]. There were 216 (60.67%) isolates of E. coli, 67 (18.82%) isolates of K. pneumoniae, 15 (4.21%) isolates of Pseudomonas spp., 44 (12.35%) isolates of Enterococcus spp.
Table 2: The distribution of organisms from outpatient, ward, Intensive Care Unit

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Among the 216 isolates of E. coli, high rate of resistance was seen to cephalosporins, fluoroquinolones, and trimethoprim-sulfamethoxazole. All 216 (100%) were susceptible to colistin, and 212 (98.14%) were susceptible to fosfomycin [Table 3]. Among the 67 isolates of K. pneumoniae, the majority were resistant to cephalosporins and fluoroquinolones. All 67 (100%) were susceptible to colistin, and 64 (95.52%) isolates were susceptible to fosfomycin.
Table 3: The susceptibility of isolated organisms to different antibiotics

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Among the 15 isolates of Pseudomonas spp. there were 13 isolates of Pseudomonas aeruginosa and 2 isolates Pseudomonas putida. All 15 (100%) were resistant to ceftazidime. High resistance rates were seen against ciprofloxacin and levofloxacin, and none were resistant to colistin [Table 3]. Among the 44 Enterococcus spp., high resistance was seen against ampicillin, ciprofloxacin, levofloxacin, and high-level gentamicin. Only 1 (2.27%) was resistant to fosfomycin, and all (100%) were susceptible to vancomycin, teicoplanin, and linezolid. The Staphylococcus isolates were not tested for fosfomycin susceptibility.

There were total 284 isolates of E. coli, K. pneumoniae, and P. mirabilis. Among these 184 (64.78%) were ESBL producers, of which 137 were E. coli and 47 were K. pneumoniae and 100 (35.21%) were non-ESBL producers, of which 79 were E. coli, 20 were K. pneumoniae, and one P. mirabilis [Table 4]. Among 288 Enterobacteriaceae isolates, 45 (15.62%) were carbapenem-resistant Enterobacteriaceae, and 123 (42.7%) isolates were found to be MDRE.
Table 4: Fosfomycin sensitivity among extended spectrum beta-lactamase producers and non-extended-spectrum beta-lactamase producers

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Among the total isolates tested for susceptibility, 337 (95.18%) out of 354 were found to be fosfomycin susceptible, 95.93% of MDRE [Table 5] and 89.13% of CRE [Table 6] were found to be susceptible to fosfomycin (MIC range for fosfomycin was 0.25–512 μg/ml). The MIC90 and MIC50 of fosfomycin for Enterobacteriaceae were found to be 8 and 2 μg/ml, respectively. The MIC90 and MIC50 of fosfomycin for K. pneumoniae were found to be 8 and 2 μg/ml, respectively. There was only one Enterobacter with MIC of 1 μg/ml. Fosfomycin resistance were found among 4 isolates of E. coli, 3 K. pneumoniae, 4 Pseudomonas spp., 3 A. baumannii complex, and one isolate each of M. morganii, B. cepacia, and Enterococcus spp.
Table 5: Fosfomycin sensitivity among multidrug-resistant Enterobacteriaceae

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Table 6: Fosfomycin sensitivity among carbapenem-resistant Enterobacteriaceae

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   Discussion Top

Fosfomycin is a novel antibiotic with good in vitro activity against the common pathogens causing UTI, particularly toward the Enterobacteriaceae. Fosfomycin is active against both Gram-negative and Gram-positive pathogens, including Entererococcus spp., Staphylococcus aureus, E. coli, Salmonella spp., Shigella spp., Klebsiella, Enterobacter spp., Serratia spp., Citrobacter spp., and P. mirabilis.[4] The activity of fosfomycin was evaluated as early as 1997 by Dastidar et al. Fosfomycin was found to possess somewhat lower activity against Staphylococcus aureus compared with other penicillins; however, it showed powerful activity toward E. coli, Klebsiella spp., and P. mirabilis.[11] In a study done by Gupta et al. from Chandigarh, among 150 uropathogenic strains of E. coli, 52.6% of isolates were ESBL producers, and all strains were susceptible to fosfomycin.[12] In another study by Mittal et al., it was found that fosfomycin was 100% sensitive to uropathogenic E. coli strains.[13] In this present study, 95.18% isolates were susceptible to fosfomycin which is similar to the findings of a study done by Sabharwal and Sharma where it was found that 94.4% of the isolates causing UTI were susceptible to fosfomycin.[14] Khawaja et al. found that after oral therapy with fosfomycin bacterial eradication was seen in 96.3% patients.[15] There is also a report of a person who returned to Canada after hospitalization in India with a resistant metallo-beta-lactamase-producer strain who was successfully treated with ertapenem and fosfomycin.[16] In a study done by Rajenderan et al., it was found that fosfomycin was the only antibiotic that effectively inhibited 90% of the strains of E. coli and Klebsiella spp.[17] Sahni et al. stated that fosfomycin susceptibility was found in 83% E. coli and 90% Enterococcus spp. and 47.6% were ESBL producers.[18] M. morganii is resistant to fosfomycin [4] as shown in this study also.

In our study, 98.14% of E. coli, 95.52% K. pneumoniae, and 97.72% Enterococcus spp. were susceptible to fosfomycin. Among the ESBL producing Enterobacteriaceae, 96.74% isolates were found to be susceptible to fosfomycin. The susceptibility among carbapenem-resistant Enterobacteriaceae was also found to be quite high, at 89.13%, which is really encouraging in the grim scenario of more commonly prescribed nephrotoxic polymyxins as the salvage therapy for these cases. Following the standard definitions accepted,[3] our study revealed about 42.7% MDRE isolates. Out of the total of 123 MDRE isolates, which were resistant to at least three (or more) groups of antibiotics, 118 (95.93%) were susceptible to fosfomycin.

The most frequent Gram-positive uropathogen encountered in our study was Enterococcus spp., which were found to be highly susceptible (97.72%) to fosfomycin. These findings also corroborate to that of Sultan et al., who found that fosfomycin was effective in 100% of methicillin-resistant S. aureus, vancomycin-resistant enterococci, ESBL, high-level aminoglycoside resistance, and overall, susceptibility to fosfomycin in AmpC producers was also extremely high.[19] Marie et al. reported that fosfomycin and colistin were the two most effective antimicrobial agents.[20] Despite of these reports of high percentage of in vitro susceptibility of fosfomycin, it was by far an underprescribed antimicrobial agent in India as well as in many parts of the world. It is also an underrated agent for complicated UTI cases though urinary concentration and safety profile is way above many other commonly prescribed antibiotics for the MDRE [21] and CRE pathogens.


This study was done for the evaluation of in vitro activity of fosfomycin and not a clinical evaluation of efficacy. There were very few Enterobacteriaceae isolates other than E. coli and K. pneumoniae found in the study.

   Conclusion Top

Fosfomycin is shown to have high in vitro activity against common uropathogens, including MDR isolates, ESBL producers, and carbapenem-resistant Enterobacteriaceae. It has a high potential to emerge as a promising and safe alternative oral agent for both outpatient and inpatient therapy of UTIs, particularly in countries, where its prescription habits among clinicians are scarce. However, further studies are needed to evaluate the various in vitro phenotypic and genotypic profiles of fosfomycin resistance among uropathogens.

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Conflicts of interest

There are no conflicts of interest.

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  [Table 1], [Table 2], [Table 3], [Table 4], [Table 5], [Table 6]

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