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Occurrence and Genomic Characterization of mcr-1-Harboring Escherichia coli Isolates from Chicken and Pig Farms in Lima, Peru.


ABSTRACT: Resistance to colistin generated by the mcr-1 gene in Enterobacteriaceae is of great concern due to its efficient worldwide spread. Despite the fact that the Lima region has a third of the Peruvian population and more than half of the national pig and poultry production, there are no reports of the occurrence of the mcr-1 gene in Escherichia coli isolated from livestock. In the present work, we studied the occurrence of E. coli carrying the mcr-1 gene in chicken and pig farms in Lima between 2019 and 2020 and described the genomic context of the mcr-1 gene. We collected fecal samples from 15 farms in 4 provinces of Lima including the capital Lima Metropolitana and recovered 341 E. coli isolates. We found that 21.3% (42/197) and 12.5% (18/144) of the chicken and pig strains were mcr-1-positive by PCR, respectively. The whole genome sequencing of 14 mcr-1-positive isolates revealed diverse sequence types (e.g., ST48 and ST602) and the presence of other 38 genes that confer resistance to 10 different classes of antibiotics, including beta-lactamase blaCTX-M-55. The mcr-1 gene was located on diverse plasmids belonging to the IncI2 and IncHI1A:IncHI1B replicon types. A comparative analysis of the plasmids showed that they contained the mcr-1 gene within varied structures (mikB-mcr1-pap2, ISApl1-mcr1-pap2, and Tn6330). To the best of our knowledge, this is the first attempt to study the prevalence of the mcr-1 gene in livestock in Peru, revealing its high occurrence in pig and chicken farms. The genetic diversity of mcr-1-positive strains suggests a complex local epidemiology calling for a coordinated surveillance under the One-Health approach that includes animals, retail meat, farmers, hospitals and the environment to effectively detect and limit the spread of colistin-resistant bacteria.

SUBMITTER: Carhuaricra D 

PROVIDER: S-EPMC9774552 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature

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Occurrence and Genomic Characterization of <i>mcr-1</i>-Harboring <i>Escherichia coli</i> Isolates from Chicken and Pig Farms in Lima, Peru.

Carhuaricra Dennis D   Duran Gonzales Carla G CG   Rodríguez Cueva Carmen L CL   Ignacion León Yennifer Y   Silvestre Espejo Thalia T   Marcelo Monge Geraldine G   Rosadio Alcántara Raúl H RH   Lincopan Nilton N   Espinoza Luis Luna LL   Maturrano Hernández Lenin L  

Antibiotics (Basel, Switzerland) 20221208 12


Resistance to colistin generated by the <i>mcr-1</i> gene in <i>Enterobacteriaceae</i> is of great concern due to its efficient worldwide spread. Despite the fact that the Lima region has a third of the Peruvian population and more than half of the national pig and poultry production, there are no reports of the occurrence of the <i>mcr-1</i> gene in <i>Escherichia coli</i> isolated from livestock. In the present work, we studied the occurrence of <i>E. coli</i> carrying the <i>mcr-1</i> gene in  ...[more]

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