Detection of CTX-M Gene β-Lactamase in Gram Negative Bacteria Isolate from Shendi Health Facilities

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جامعة الشيخ عبدالله البدري
Abstract: Background: The emergence of antibiotic resistance pathogen is an important health risk, usually gram negative bacteria acquire resistance to antibiotics by the production of beta-lactamase enzyme, CTX-M-type enzymes are a group of class A extended-spectrum B-lactamases (ESBLs) that are rapidly Spreading among gram-negative worldwide. CTX-M-type ESBLs exhibit powerful activity against cefotaxime and ceftriaxone antibiotics but generally not against ceftazidime, in some geographical areas, CTX-M is now the most prevalent ESBLs in Enterobacteriaceae. There are 172 known variants of CTX-M genes identified until August 25, 2016. Objectives: This present study aims to identify the gene, namely: CTX-M, Responsible for extended-spectrum beta-lactamase (ESBL) among Enterobacteriaceae isolated from different samples of Sudanese patients in Shendi city (urine, pus, and wound). Methodology: 200 samples were identified as gram-negative bacteria. Identification of the isolates was done by using conventional biochemical methods, and ESBLs were screened according to (CLSI) guidelines. ESBLs Positive strains were tested for the presence of ESBL encoding CTX-M, Gene by using PCR with specific primers for the detection of CTX-M. Results: ESBL found to be higher in P. aeruginosa n=18(78.3%) Klebsiella spp n=45 (64.2%). Escherichia coli n=51(57.3%) Proteus n=8(53.3%) the total of ESBL from all gram-negative isolate represent n=122 (61%). The presence of the CTX-M, the gene was confirmed in n=57(46.8%) in all isolates. The CTX-M gene were detected in n= 17 (37.8%) Klebsiella spp, n=28(55%) of Escherichia coli, n=3(37.5%) in Proteus and n=9 (50%) in P. aeruginosa isolates. Conclusion: P. aeruginosa isolates represent a high percentage of ESBL producers followed by Klebsiella spp, then Escherichia coli and proteus spp CTX-M gen detected commonly in Escherichia coli followed by P. aeruginosa then Klebsiella spp and Proteus spp. The study concludes that the ESBL production within gram-negative bacteria was high and the CTX-M gene was spread in Shendi city.