Dataset Information

Co-infection With Chromosomally-Located bla _CTX-M-14 and Plasmid-Encoding bla _CTX-M-15 in Pathogenic Escherichia coli in the Republic of Korea.

ABSTRACT: The emergence of third-generation cephalosporin resistance in Escherichia coli is increasing at an alarming rate in many countries. Thus, the aim of this study was to analyze co-infecting bla _CTX-M-producing pathogenic E. coli isolates linked to three school outbreaks. Among 66 E. coli isolates, 44 were identified as ETEC O25, an ETEC isolate serotype was O2, and the other 21 were confirmed as EAEC O44. Interestingly, six patients were co-infected with EAEC O44 and ETEC O25. For these isolates, molecular analysis [antibiotic susceptibility testing, identification of the ?-lactamase gene, multilocus sequence typing (MLST), and pulsed-field gel electrophoresis (PFGE)] was performed for further characterization. In addition, the transmission capacity of bla _CTX-M genes was examined by conjugation experiments. Whole-genome sequencing (WGS) was performed on representative EAEC O44 and ETEC O25 isolates associated with co-infection and single-infection. All isolates were resistant to cefotaxime and ceftriaxone. All EAEC isolates carried the bla _CTX-M-14 gene and all ETEC isolates the bla _CTX-M-15 gene, as detected by multiplex PCR and sequencing analysis. Sequence type and PFGE results indicated three different patterns depending on the O serotype. WGS results of representative isolates revealed that the ETEC O25 strains harbored bla _CTX-M-15 located on IncK plasmids associated with the ?bla _TEM-bla _CTX-M-15-orf477 transposon. The representative EAEC O44 isolates carried bla _CTX-M-14 on the chromosome, which was surrounded by the ISEcp1-bla _CTX-M-14-IS903 transposon. To the best of our knowledge, this is the first report of co-infection with chromosomally located bla _CTX-M-14 and plasmid-encoding bla _CTX-M-15 in pathogenic E. coli. Our findings indicate that resistance genes in clinical isolates can spread through concurrent combinations of chromosomes and plasmids.

SUBMITTER: Park J

PROVIDER: S-EPMC7686028 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Co-infection With Chromosomally-Located bla CTX-M-14 and Plasmid-Encoding bla CTX-M-15 in Pathogenic Escherichia coli in the Republic of Korea.

Park Jungsun J Shin Eunkyung E Park Ae Kyung AK Kim Soojin S Jeong Hyun Ju HJ Kim Jin Seok JS Jin Young-Hee YH Park Nan Joo NJ Chun Jeong-Hoon JH Hwang Kyujam K Lee Kwang Jun KJ Kim Junyoung J

Frontiers in microbiology 20201111

The emergence of third-generation cephalosporin resistance in Escherichia coli is increasing at an alarming rate in many countries. Thus, the aim of this study was to analyze co-infecting bla CTX-M-producing pathogenic E. coli isolates linked to three school outbreaks. Among 66 E. coli isolates, 44 were identified as ETEC O25, an ETEC isolate serotype was O2, and the other 21 were confirmed as EAEC O44. Interestingly, six patients were co-infected with EAEC ...[more]

PMID: 33262742

Similar Datasets

Project description:Nontyphoidal Salmonella (NTS) is one of the most prevalent bacterial causes of gastrointestinal infections worldwide. Meanwhile, the detection rate of CTX-M-55 ESBL-positive has increased gradually in China. To identify the molecular epidemiological and genomic characteristics of blaCTX-M-55-carrying nontyphoidal Salmonella (NTS) clinical isolates, a total of 105 NTS isolates were collected from a Chinese tertiary hospital. Antimicrobial susceptibility testing was performed to determine the resistance phenotype. Whole-genome sequencing and bioinformatics analysis were used to determine the antimicrobial resistance genes, serotypes, phylogenetic relationships, and the genetic environment of the blaCTX-M-55 gene. The results showed that among the 22 ceftriaxone resistant isolates, the blaCTX-M-55 was the most common β-Lactamase gene carried by 14 isolates, including serotypes S. Typhimurium (10/14), S. Muenster (2/14), S. Rissen (1/14), and S. Saintpaul (1/14). Phylogenetic analysis shows that 10 blaCTX-M-55-positive S. Typhimurium ST34 isolates were divided into two clusters. The genetic relationship of isolates in each cluster was very close (≤10 cgMLST loci). The blaCTX-M-55 gene was located on the chromosome in 10 isolates, on IncI1 plasmid in three isolates, and IncHI2 plasmid in one isolate. In conclusion, the blaCTX-M-55 gene, mainly located on the chromosome of S. Typhimurium ST34 isolates, was the main driving force associated with the resistance of NTS to cephalosporins. Therefore, close attention to the clonal dissemination of blaCTX-M-55-carrying S. Typhimurium ST34 in clinical settings must be monitored carefully. IMPORTANCE ESCs are the first choice for treating NTS infections. However, ESBLs and AmpC β-lactamases are the most typical cause for ESCs resistance. The CTX-M-55 ESBL-positive rate has gradually increased in the clinic in recent years. At present, the research about blaCTX-M-55-positive Salmonella mainly focuses on the foodborne animals or the environment while less on clinical patients. Thus, this study was carried out for identifying molecular epidemiological and genomic characteristics of blaCTX-M-55-carrying NTS clinical isolates. The results showed that the blaCTX-M-55 gene, mainly located on the chromosome of S. Typhimurium ST34 isolates from Conghua District, was the main driving force associated with the resistance of NTS to cephalosporins. Therefore, our work highlights the importance of monitoring the clonal dissemination of blaCTX-M-55-carrying S. Typhimurium ST34 in clinical settings.

Dataset Information

Co-infection With Chromosomally-Located bla _CTX-M-14 and Plasmid-Encoding bla _CTX-M-15 in Pathogenic Escherichia coli in the Republic of Korea.

Publications

Co-infection With Chromosomally-Located <i>bla</i> <sub>CTX-M-14</sub> and Plasmid-Encoding <i>bla</i> <sub>CTX-M-15</sub> in Pathogenic <i>Escherichia coli</i> in the Republic of Korea.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets