High incidence of multidrug-resistant Escherichia coli coharboring mcr-1 and blaCTX-M-15 recovered from pigs
| Autor: | Jan Mohammad Shah, Muhammad Shafiq, Liping Wang, Sadeeq ur Rahman, Mengli Wang, Jinhu Huang, Yi Gao, Li Chen |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Pharmacology 030106 microbiology biochemical phenomena metabolism and nutrition Biology bacterial infections and mycoses medicine.disease_cause Microbiology Multiple drug resistance 03 medical and health sciences 0302 clinical medicine Infectious Diseases Plasmid polycyclic compounds medicine Colistin Pharmacology (medical) MCR-1 030212 general & internal medicine Typing Escherichia coli Genotyping Southern blot medicine.drug |
| Zdroj: | Infection and Drug Resistance. 12:2135-2149 |
| ISSN: | 1178-6973 |
| DOI: | 10.2147/idr.s209473 |
| Popis: | Purpose The coexistence of mobile colistin (COL)-resistant gene mcr-1 with extended-spectrum beta-lactamase (ESBL) gene in Escherichia coli has become a serious threat globally. The aim of this study was to investigate the increasing resistance to COL and in particular its coexistence with ESBL-producing E. coli recovered from pig farms in China. Materials and methods E. coli were isolated from 14 pig farms in Jiangsu China. Susceptibility testing was identified by micro-dilution method. PCR assay and nucleotide sequencing were used to detect COL-resistant genes, mcr-1 to -5, as well as ESBL genes, bla CTX-M, bla SHV and bla TEM. Conjugation experiment, plasmid replicon typing of the multidrug resistance (MDR), S1-PFGE and DNA southern hybridization were performed to study the transferability of these genes. Results Overall, 275 E. coli isolates were recovered from a total of 432 cloacal and nasal swabs. More than 90% of the isolates were MDR, of which 70.18% were resistant to COL. Of these 275 isolates, mcr-1 was identified as the most predominant gene carried by 71.63% (197/275) of isolates, 39.59% (78/197) of the isolates were harboring both mcr-1 and ESBL genes (bla CTX-M, bla SHV and bla TEM). ESBL genotyping showed that bla CTX-M was the most predominant ESBL (68.49%) followed by bla SHV (16.4%) and bla TEM (15%). Sequencing revealed that the most common variants of bla CTX-M identified were, bla CTX-M-15 (69%), bla CTX-M-55 (29%) and bla CTX-M-1 (1.8%). IncHI2, IncFIB, IncFIC, IncN and IncX4 were found to be the most common Inc-types found both in donors and in transconjugants and were associated with the transfer of the mcr-1 and ESBL encoding genes. Six strains carried a total of five different plasmids: approximately 97-, 130-, 160-, 227- and 242-kb plasmids. Conclusion The coexistence of the mcr-1- and bla CTX-M-15-carrying isolates displaying high MDR, recovered from E. coli of pig origin, is a major concern for both humans and veterinary medicine. |
| Databáze: | OpenAIRE |
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