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Resistance to colistin and production of extended-spectrum Beta-lactamases and/or AmpC enzymes in Salmonella isolates collected from healthy pigs in Northwest Spain in two periods: 2008-2009 and 2018

Investigation published in International Journal of Food Microbiology

November 10th, 2020

Salmonellosis is a common subclinical infection in pigs and therefore apparently healthy animals may represent a reservoir of antibiotic-resistant Salmonella for humans. This study estimates and characterizes resistance to two classes of antimicrobials considered of the highest priority within the critically important antimicrobials for humans, i.e. colistin (CR) and 3rd generation cephalosporins (3GC), on a collection of Salmonella isolates from pigs from two periods: between 2008 and 09, when colistin was massively used; and in 2018, after three years under a National Plan against Antibiotic Resistance. Prevalence of CR was low (6 out of 625; 0.96%; 95%CI: 0.44-2.1) in 2008-09 and associated mostly to the mcr-1 gene, which was detected in four S. 4,5,12:i:- isolates. Polymorphisms in the pmrAB genes were detected in a S. 9,12:-:- isolate. No CR was detected in 2018 out of 59 isolates tested. Among 270 Salmonella isolates considered for the assessment of resistance to 3GC in the 2008-2009 sampling, only one Salmonella Bredeney (0.37%; 95%CI: 0.07-2.1) showed resistance to 3GC, which was associated with the blaCMY-2 gene (AmpC producer). In 2018, six isolates out of 59 (10.2%; 95%CI: 4.7-20.5) showed resistance to 3GC, but only two different strains were identified (S. 4,12:i:- and S. Rissen), both confirmed as extended-spectrum Beta-lactamases (ESBL) producers. The blaCTX-M-3 and blaTEM-1b genes in S. 4,12:i:- and the blaTEM-1b gene in S. Rissen seemed to be associated with this resistance. Overall, the prevalence of CR in Salmonella appeared to be very low in 2008-2009 despite the considerable use of colistin in pigs at that time, and seemed to remain so in 2018. Resistance to 3GC was even lower in 2008-2009 but somewhat higher in 2018. Resistance was mostly coded by genes associated with mobile genetic elements. Most serotypes involved in these antimicrobial resistances displayed a multidrug resistance pattern and were considered zoonotic




Sevilla E., Vico JP., Delgado-Blas JF., Gonzalez-Zorn B., Marin CM., Uruen C., Martin-Burriel I., Bolea R. and Mainar-Jaime RC.




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Resistance to colistin and production of extended-spectrum Beta-lactamases and/or AmpC enzymes in Salmonella isolates collected from healthy pigs in Northwest Spain in two periods: 2008-2009 and 2018

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Resistance to colistin and production of extended-spectrum Beta-lactamases and/or AmpC enzymes in Salmonella isolates collected from healthy pigs in Northwest Spain in two periods: 2008-2009 and 2018



Participants:

Universidad de ZaragozaDepartamento de Patología Animal. Facultad de Veterinaria. Universidad de Zaragoza (UNIZAR).

Instituto Agroalimentario de Aragón.

Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET).

Universidad Católica de Córdoba.

Universidad ComplutenseServicio de Zoonosis de Transmisión Alimentaria y Resistencia a Antimicrobianos (ZTA). Centro de Vigilancia Sanitaria Veterinaria (VISAVET). Universidad Complutense (UCM).

Universidad ComplutenseDepartamento de Sanidad Animal. Facultad de Veterinaria. Universidad Complutense (UCM).

Laboratorio de Genética Bioquímica (LAGENBIO).







FACTOR YEAR Q
5.277 2020

NLMID: 8412849

PMID: 33243630

ISSN: 0168-1605



TITLE: Resistance to colistin and production of extended-spectrum Beta-lactamases and/or AmpC enzymes in Salmonella isolates collected from healthy pigs in Northwest Spain in two periods: 2008-2009 and 2018


JOURNAL: Int. J. Food Microbiol.


NUMERACIÓN: 108967


AÑO: 2020


PUBLISHER: Elsevier Science Publishers


AUTHORS: Sevilla E., Vico JP., Delgado-Blas JF., Gonzalez-Zorn B., Marin CM., Uruen C., Martin-Burriel I., Bolea R. and Mainar-Jaime RC.


VISAVET PARTICIPANTS


3rd
José Francisco Delgado Blas
4th
Bruno González Zorn

DOI: https://doi.org/10.1016/j.ijfoodmicro.2020.108967


CITE THIS PUBLICATION:

Sevilla E., Vico JP., Delgado-Blas JF., Gonzalez-Zorn B., Marin CM., Uruen C., Martin-Burriel I., Bolea R. and Mainar-Jaime RC. Resistance to colistin and production of extended-spectrum Beta-lactamases and/or AmpC enzymes in Salmonella isolates collected from healthy pigs in Northwest Spain in two periods: 2008-2009 and 2018. International Journal of Food Microbiology. 108967. 2020. (A). ISSN: 0168-1605. DOI: 10.1016/j.ijfoodmicro.2020.108967


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