Infection and Drug Resistance (Oct 2023)

Emergence of ST1193 Clone in Maternal and Neonatal ESBL-Producing E. coli Isolates

  • Wei L,
  • Chen Q,
  • Yang L,
  • Ji T,
  • Peng W,
  • Shao B,
  • Li H

Journal volume & issue
Vol. Volume 16
pp. 6681 – 6689

Abstract

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Ling Wei,1,* Qiyan Chen,2,3,* Lu Yang,2,3 Tongzhen Ji,4 Wenjing Peng,5 Bing Shao,2 Hui Li2 1Department of Obstetrics, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, People’s Republic of China; 2Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing Center for Disease Prevention and Control, Beijing, People’s Republic of China; 3National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, China Agricultural University, Beijing, People’s Republic of China; 4Department of Clinical Laboratory, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, People’s Republic of China; 5College of Animal Husbandry and Veterinary Medicine, Jinzhou Medical University, Jinzhou, People’s Republic of China*These authors contributed equally to this workCorrespondence: Hui Li; Bing Shao, Email [email protected]; [email protected]: The emerging epidemic of extended-spectrum β-lactamase-producing E. coli (ESBL-EC) is a global public health crisis. ESBL-EC infections are increasing worldwide and contribute to morbidity and mortality among newborn infants. However, the antimicrobial resistance characteristics and clonal transmission of maternal and neonatal ESBL-EC isolates need to be further deciphered.Materials and Methods: We performed phenotypic and genotypic characterization of 33 ESBL-EC isolates from pregnant women and newborn during 2019– 2020.Results: Minimum inhibitory concentrations of 17 antimicrobial agents showed that all isolates were multidrug-resistant (MDR) and had a resistance rate of 100% to ampicillin, and mild resistance to florfenicol, gentamicin, ceftazidime, and amoxicillin-clavulanate. Additionally, imipenem, meropenem, polymyxin, and tigecycline exhibited good activity against the tested ESBL-EC isolates with low MIC50 (0.06– 1 μg/mL) and MIC90 (0.06– 1 μg/mL). Whole genome sequencing indicated that ESBL-EC isolates contained diverse antimicrobial resistant genes (blaCTX-M, blaTEM, blaSHV, tetA, etc.) and toxin genes (ompA, csg, fimH, hybtA, etc.). blaCTX-M genes were the main ESBL genotype. ST1193 (18.2%) was the second most abundant ST among the ESBL-EC isolates (ST131 was the most common, with 30.3%), and this is the first report of its mother-to-infant colonization transmission in China.Conclusion: These findings revealed the occurrence of high-risk ST1193 clone among ESBL-EC isolates from pregnant women and newborn colonization in China. Further national or regional multicenter studies are needed to assess the dissemination and evolution of ESBL-EC ST1193 clone as a nosocomial pathogen in China.Keywords: ESBL, E. coli, antibiotic resistance, colonization transmission, ST1193 clone

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