Characteristics of tet (X4)-Producing Escherichia coli in Chicken and Pig Farms in Hunan Province, China
The plasmid-mediated tigecycline resistance gene (X4) confers a high level of resistance to tigecycline. The experiment aims to investigate the prevalence and characterization of (X4) in isolates from chicken and pig farms in Hunan province, China. A total of six (X4) positive strains were identifie...
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Published in | Antibiotics (Basel) Vol. 12; no. 1; p. 147 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Switzerland
MDPI AG
11.01.2023
MDPI |
Subjects | |
Online Access | Get full text |
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Summary: | The plasmid-mediated tigecycline resistance gene
(X4) confers a high level of resistance to tigecycline. The experiment aims to investigate the prevalence and characterization of
(X4) in
isolates from chicken and pig farms in Hunan province, China.
A total of six
(X4) positive strains were identified in 257
derived from chicken samples in Xiangtan city (
= 2), pig samples in Xiangxiang city (
= 1), Chenzhou city (
= 2), and Zhuzhou city (
= 1). The presence of
(X4) was directly detected by PCR assay, and then the broth dilution method determined the antimicrobial susceptibility profile of the
(X4)-positive isolates. Genomic locations were identified by whole-genome sequencing (WGS) and bioinformatics.
Almost all
(X4)-positive strains showed high resistance to multidrug, including tigecycline. Resistome analysis revealed many antibiotic resistance genes, including those with resistance to tetracyclines, β-lactams, phenicols, quinolones, lincosamides chloramphenicol, aminoglycosides and sulfamids. These
(X4)-bearing strains exhibited six distract STs, such as ST10, 202, ST218, ST362, ST2077, ST7068. The plasmid replicon types carrying
(X4) were the hybrid plasmid IncFIA(HI1)/IncHIA/IncHIB(R27) (5/6) and IncX1 (1/6).
The presence of similar genetic environments in
from different cities suggests there may be horizontal transmission pathways promoting the broad spread of drug-resistant genes in Hunan Province, putting great pressure on multidrug resistance monitoring. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 These authors contributed equally to this work. |
ISSN: | 2079-6382 2079-6382 |
DOI: | 10.3390/antibiotics12010147 |