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The emergence and spread of extended-spectrum β-lactamases (ESBLs) particularly CTX-M producing multi-drug-resistant (MDR)  () is one of the greatest challenges for community health globally. The study investigated the phenotypic and genotypic characteristics of ESBLs-producing  recovered from pediatric patients from Shenzhen Children's Hospital, China.  Present study, a total of 2,670 isolates of .  were collected from Shenzhen Children's Hospital, China of which 950 were ESBLs producer. ESBLs production was confirmed by using the combination disc diffusion method, and antimicrobial susceptibility test was detected. In addition, β-lactamase-producing genes and co-existence of carbapenem/colistin resistance genes were determined by PCR assay and sequencing. The diversity and phylogenetic relationship were determined by multi-locus sequence typing method.  Thirty-five percent (=950) prevalence of ESBLs-producing .  we reported in Shenzhen, China of which 50 ESBLs producing  were randomly selected for a further characterization. All 50 ESBLs- producing  isolates revealed MDR phenotype and 100% were resistant to Ampicillin/sulbactam, Ampicillin, Cefazolin, and Ceftriaxone. All 50 ESBLs producers harbored at least one type of β-lactamase gene particular  . The PCR and sequencing revealed the most common CTX-M subtype was  (=18), followed by  (=16),  (=9),  (=3),  , and  each (=1). Co-existence of   with  ,  ,  , and   was detected in few isolates. Among identified sequence types, ST131 (12%) was more dominant in ESBLs-producing . Phylogenetic group A was the most prominent group among the ESBLs-producing  based on multiplex PCR.  Our study shows the prevalence of   gene in ESBLs-producing  in pediatric patients in Shenzhen, China. We highlight the importance to monitor the emergence and trends of ESBLs-producing isolates in a pediatric healthcare setting.

infection and drug resistance

&lt;p&gt;Phenotypic and genotypic characterization of multi-&lt;br /&gt;drug-resistant &lt;em&gt;Escherichia coli&lt;/em&gt; isolates harboring &lt;br /&gt;bla&lt;sub&gt;CTX-M&lt;/sub&gt; group extended-spectrum β-lactamases recovered &lt;br /&gt;from pediatric patients in Shenzhen, southern China&lt;/p&gt;