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Yalda Malekzadegan Elham Rastegar Melika Moradi Hamid Heidari Hadi Sedigh EbrahimSaraie 3 1Department of Bacteriology and Virology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran; 2Department of Microbiology, Faculty of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran; 3Razi Clinical Research Development Center, Guilan University of Medical Sciences, Rasht, Iran Dear editor We are grateful for the comments from our readers and their interest in our work. Also, we thank the editor for the opportunity to respond to the criticisms offered about our article. At first, Dr. Bhoj R. Singh highlighted one of our limitations that we already cited in our article and clearly stated that “further studies are required in larger series.” But, 121 Escherichia coli isolated from urinary tract infections (UTIs) during a six months period from a major referral hospital is low in Dr. Bhoj R. Singh opinion, while their 46 isolates are not. Anyway, if they had a concern regarding the epidemiological strength of our report on nalidixic acid and ciprofloxacin susceptibility, we would like bring to your attention to our previous retrospective study in the same hospital on 9991 UTI cases, and also another multicenter report on pyelonephritis, cystitis, and urosepsis cases. Second, regarding Dr. Bhoj R. Singh concern about uropathogenic nature of our E. coli isolates and the absence of any confirmatory test, I invite our readers to read carefully our methods. Since we said that our samples derived from our previous work, where we detected fimH in 98.3% of isolates as a constitutive gene and potential vaccine candidate for uropathogenic E. coli (UPEC). But, apart from our work, you can not find any standard method in the literature that certainly introducing a confirmatory test for identification of UPEC, and all of them such as pure isolation from a UTI episode, the presence of some adhesions or specific O-serogroups are just presumptive. But regarding data presented by Dr. Bhoj R. Singh and comparing their critical situation with our country, we thought that some points must be clarified. We try to compare our fluoroquinolones resistance rates with the majority of previous works within the country and it seems that the overall resistance rates are about 40–50%. But, you claimed that India situation is far worse than Iran based on your results from an institutional laboratory with only 46 isolates with no other citation showing the same finding. Also, we are wondering that as an academic member, there were several scientific mistakes for writing bacterial names in your report. Meanwhile, you raise a concern that our E. coli isolates may be just contamination rather than a true episode of UTI (which was clearly defined in our methods); but we have same concern since the majority of your bacterial isolates are usually contamination rather than a true cause of UTI. Another concern about your data is saying Metallo-β-lactamase (MBL) Correspondence: Hadi Sedigh EbrahimSaraie Razi Clinical Research Development Center, Guilan University of Medical Sciences, Sardar-E-Jangal Street, Rasht, Guilan, Iran Tel/Fax +98 0 133 354 2460 Email seddigh.hadi@gums.ac.ir Infection and Drug Resistance Dovepress open access to scientific and medical research

infection and drug resistance

&lt;p&gt;Prevalence of quinolone-resistant uropathogenic &lt;em&gt;Escherichia coli&lt;/em&gt; in a tertiary care hospital in south Iran [Response to letter]&lt;/p&gt;