Clinical significance and phylogenetic background of extended spectrum β-lactamase producing Escherichia coli isolates from extra-intestinal infections

Arindam Chakraborty, Prabha Adhikari, Shalini Shenoy, Vishwas Saralaya

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Introduction: Escherichia coli producing extended spectrum-β-lactamases (ESBL), particularly CTX-M type ESBLs, have rapidly spread worldwide and pose a serious threat for healthcare-associated infections. We performed a molecular detection and characterization study of ESBL-related bla genes, including blaTEM, blaSHV, blaCTX-M, and blaCTX-M15, and also assessed the relationship between the phylogenetic background of strains carrying ESBL genes and the patient's clinical outcome. Methodology: A total of 300 non-repeated, clinically significant isolates were investigated. The molecular types of ESBL genes were determined using multiplex PCR. Phylogenetic analysis was performed using triplex PCR methods. Antibiograms and the patient's clinical outcome were collected in a structured pro forma. Results: Among the 300 isolates, 212 (70.5%) isolates were found to carry ESBL genes. A total of 186 (62%) strains were positive for the blaCTX-M gene, and 171 isolates (approximately 92%) of these blaCTX-M producers were positive for blaCTXM-15. Phylogenetic analysis of the isolates indicated that 41 (67%) Group A, 22 (81.50%) group B1, 67 (64.5%) group B2 and 82 (76%) group D isolates carried different ESBL genes. Appropriate antibiotic therapy helped to resolve infection in 66.5% patients. Conclusion: Our study documented the high prevalence of ESBLs in E. coli isolates, with CTX-M-15 as the predominant ESBL gene in the region, and these isolates predominantly belonged to commensal phylo-groups. Thus, an appropriate antibiotic and hospital policy is required to reduce the horizontal spread of ESBL genes among various bacterial strains, whereas in the near future, the spread of ESBL producers may result in therapeutic dead ends.

Original languageEnglish
Pages (from-to)248-253
Number of pages6
JournalJournal of Infection and Public Health
Volume8
Issue number3
DOIs
Publication statusPublished - 01-05-2015

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Escherichia coli
Infection
Genes
Multiplex Polymerase Chain Reaction
Anti-Bacterial Agents
Microbial Sensitivity Tests
Cross Infection
Therapeutics
galantide

All Science Journal Classification (ASJC) codes

  • Public Health, Environmental and Occupational Health
  • Infectious Diseases

Cite this

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title = "Clinical significance and phylogenetic background of extended spectrum β-lactamase producing Escherichia coli isolates from extra-intestinal infections",
abstract = "Introduction: Escherichia coli producing extended spectrum-β-lactamases (ESBL), particularly CTX-M type ESBLs, have rapidly spread worldwide and pose a serious threat for healthcare-associated infections. We performed a molecular detection and characterization study of ESBL-related bla genes, including blaTEM, blaSHV, blaCTX-M, and blaCTX-M15, and also assessed the relationship between the phylogenetic background of strains carrying ESBL genes and the patient's clinical outcome. Methodology: A total of 300 non-repeated, clinically significant isolates were investigated. The molecular types of ESBL genes were determined using multiplex PCR. Phylogenetic analysis was performed using triplex PCR methods. Antibiograms and the patient's clinical outcome were collected in a structured pro forma. Results: Among the 300 isolates, 212 (70.5{\%}) isolates were found to carry ESBL genes. A total of 186 (62{\%}) strains were positive for the blaCTX-M gene, and 171 isolates (approximately 92{\%}) of these blaCTX-M producers were positive for blaCTXM-15. Phylogenetic analysis of the isolates indicated that 41 (67{\%}) Group A, 22 (81.50{\%}) group B1, 67 (64.5{\%}) group B2 and 82 (76{\%}) group D isolates carried different ESBL genes. Appropriate antibiotic therapy helped to resolve infection in 66.5{\%} patients. Conclusion: Our study documented the high prevalence of ESBLs in E. coli isolates, with CTX-M-15 as the predominant ESBL gene in the region, and these isolates predominantly belonged to commensal phylo-groups. Thus, an appropriate antibiotic and hospital policy is required to reduce the horizontal spread of ESBL genes among various bacterial strains, whereas in the near future, the spread of ESBL producers may result in therapeutic dead ends.",
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Clinical significance and phylogenetic background of extended spectrum β-lactamase producing Escherichia coli isolates from extra-intestinal infections. / Chakraborty, Arindam; Adhikari, Prabha; Shenoy, Shalini; Saralaya, Vishwas.

In: Journal of Infection and Public Health, Vol. 8, No. 3, 01.05.2015, p. 248-253.

Research output: Contribution to journalArticle

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T1 - Clinical significance and phylogenetic background of extended spectrum β-lactamase producing Escherichia coli isolates from extra-intestinal infections

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AU - Adhikari, Prabha

AU - Shenoy, Shalini

AU - Saralaya, Vishwas

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N2 - Introduction: Escherichia coli producing extended spectrum-β-lactamases (ESBL), particularly CTX-M type ESBLs, have rapidly spread worldwide and pose a serious threat for healthcare-associated infections. We performed a molecular detection and characterization study of ESBL-related bla genes, including blaTEM, blaSHV, blaCTX-M, and blaCTX-M15, and also assessed the relationship between the phylogenetic background of strains carrying ESBL genes and the patient's clinical outcome. Methodology: A total of 300 non-repeated, clinically significant isolates were investigated. The molecular types of ESBL genes were determined using multiplex PCR. Phylogenetic analysis was performed using triplex PCR methods. Antibiograms and the patient's clinical outcome were collected in a structured pro forma. Results: Among the 300 isolates, 212 (70.5%) isolates were found to carry ESBL genes. A total of 186 (62%) strains were positive for the blaCTX-M gene, and 171 isolates (approximately 92%) of these blaCTX-M producers were positive for blaCTXM-15. Phylogenetic analysis of the isolates indicated that 41 (67%) Group A, 22 (81.50%) group B1, 67 (64.5%) group B2 and 82 (76%) group D isolates carried different ESBL genes. Appropriate antibiotic therapy helped to resolve infection in 66.5% patients. Conclusion: Our study documented the high prevalence of ESBLs in E. coli isolates, with CTX-M-15 as the predominant ESBL gene in the region, and these isolates predominantly belonged to commensal phylo-groups. Thus, an appropriate antibiotic and hospital policy is required to reduce the horizontal spread of ESBL genes among various bacterial strains, whereas in the near future, the spread of ESBL producers may result in therapeutic dead ends.

AB - Introduction: Escherichia coli producing extended spectrum-β-lactamases (ESBL), particularly CTX-M type ESBLs, have rapidly spread worldwide and pose a serious threat for healthcare-associated infections. We performed a molecular detection and characterization study of ESBL-related bla genes, including blaTEM, blaSHV, blaCTX-M, and blaCTX-M15, and also assessed the relationship between the phylogenetic background of strains carrying ESBL genes and the patient's clinical outcome. Methodology: A total of 300 non-repeated, clinically significant isolates were investigated. The molecular types of ESBL genes were determined using multiplex PCR. Phylogenetic analysis was performed using triplex PCR methods. Antibiograms and the patient's clinical outcome were collected in a structured pro forma. Results: Among the 300 isolates, 212 (70.5%) isolates were found to carry ESBL genes. A total of 186 (62%) strains were positive for the blaCTX-M gene, and 171 isolates (approximately 92%) of these blaCTX-M producers were positive for blaCTXM-15. Phylogenetic analysis of the isolates indicated that 41 (67%) Group A, 22 (81.50%) group B1, 67 (64.5%) group B2 and 82 (76%) group D isolates carried different ESBL genes. Appropriate antibiotic therapy helped to resolve infection in 66.5% patients. Conclusion: Our study documented the high prevalence of ESBLs in E. coli isolates, with CTX-M-15 as the predominant ESBL gene in the region, and these isolates predominantly belonged to commensal phylo-groups. Thus, an appropriate antibiotic and hospital policy is required to reduce the horizontal spread of ESBL genes among various bacterial strains, whereas in the near future, the spread of ESBL producers may result in therapeutic dead ends.

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