Abstract
Background: Antibiotic resistance among bacteria is a worldwide problem. Enterobacteriaceae resistance to third-generation cephalosporins is typically caused by the production of β-lactamases. Objectives: The aim of this study was to determine antimicrobial susceptibility of environmental Enterobacteriaceae isolates from Karun River in Iran. Materials and Methods: A total of 600 water samples were collected from nine stations along Karun River in Iran, during spring and summer of 2012. In this research, different waterborne bacterial pathogens were isolated and identified using the membrane filtration technique and analytical profile index system for Enterobacteriaceae (API 20E). Then, disk diffusion method (CLSI, 2010; M2-A9) was used for testing the antibiotic resistance susceptibility. Enterobacteriaceae genera were tested against sixteen antibiotics: ampicillin, carbencillin, methicillin, cephalothin, cefotaxime, vancomycin, amikacin, ofloxacin, kanamycin, tetracycline, erythromycin, clindamycin, norfloxacin, nitrofurantoin, chloramphenicol, and amoxycillin. Results: The results of this study suggested that the level of fecal contamination in Karun water was very high. Among the isolated Enterobacteriaceae, there were 287 strains of (65%) Escherichia coli, 162 (27%) Enterobacter aeogenes, 73 (12.16%) Citrobacter freundii, 58 (9.66%) Proteus vulgaris, and 20 (3.3%) Salmonella typhi. All Enterobacteriaceae isolates showed 100% resistance to ampicillin, carbenicillin, methicillin, vancomycin, erythromycin, clindamycin, and tetracycline. They failed to exhibit resistance to norfloxacin and ofloxacin. Other antibiotics showed intermediate activity, and some isolates were resistant. Conclusions: Detection of fecal indicator bacteria (E. coli) in more than 75% of water samples indicates the possible presence of other bacteria causing infectious diseases.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.