Susceptibility of Commensal <i>E. coli</i> Isolated from Conventional, Antibiotic-Free, and Organic Meat Chickens on Farms and at Slaughter toward Antimicrobials with Public Health Relevance

The spread of resistant bacteria from livestock to the food industry promoted an increase of alternative poultry production systems, such as organic and antibiotic-free ones, based on the lack of antimicrobial use, except in cases in which welfare is compromised. We aimed to investigate the antibiot...

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Autores principales:	Laura Musa, Patrizia Casagrande Proietti, Maria Luisa Marenzoni, Valentina Stefanetti, Tana Shtylla Kika, Francesca Blasi, Chiara Francesca Magistrali, Valeria Toppi, David Ranucci, Raffaella Branciari, Maria Pia Franciosini
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	broiler chicken antimicrobial susceptibility microdilution test commensal <i>E. coli</i> organic system antibiotic-free system Therapeutics. Pharmacology RM1-950
Acceso en línea:	https://doaj.org/article/46e20edce9f245cfaa218c61dd57d67b
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spelling	oai:doaj.org-article:46e20edce9f245cfaa218c61dd57d67b2021-11-25T16:22:47ZSusceptibility of Commensal <i>E. coli</i> Isolated from Conventional, Antibiotic-Free, and Organic Meat Chickens on Farms and at Slaughter toward Antimicrobials with Public Health Relevance10.3390/antibiotics101113212079-6382https://doaj.org/article/46e20edce9f245cfaa218c61dd57d67b2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-6382/10/11/1321https://doaj.org/toc/2079-6382The spread of resistant bacteria from livestock to the food industry promoted an increase of alternative poultry production systems, such as organic and antibiotic-free ones, based on the lack of antimicrobial use, except in cases in which welfare is compromised. We aimed to investigate the antibiotic susceptibility of commensal <i>E</i><i>scherichia c</i><i>oli</i> isolated from organic, antibiotic-free, and conventional broiler farms and slaughterhouses toward several antimicrobials critically important for human health. To assess antimicrobial susceptibility, all <i>E. coli</i> isolates and extended spectrum beta-lactamase (ESBL) <i>E. coli</i> were analysed by the microdilution method. The prevalence of tigecycline, azithromycin and gentamicin <i>E. coli</i>-resistant strains was highest in organic samplings. Conversely, the lowest prevalence of resistant <i>E. coli</i> strains was observed for cefotaxime, ceftazidime and ciprofloxacin in organic systems, representing a significant protective factor compared to conventional systems. All <i>E. coli</i> strains were colistin-susceptible. Contamination of the external environment by drug-resistant bacteria could play a role in the presence of resistant strains detected in organic systems. Of interest is the highest prevalence of cephalosporin resistance of <i>E. coli</i> in conventional samplings, since they are not permitted in poultry. Our results suggest that monitoring of antibiotic resistance of the production chain may be helpful to detect “risks” inherent to different rearing systems.Laura MusaPatrizia Casagrande ProiettiMaria Luisa MarenzoniValentina StefanettiTana Shtylla KikaFrancesca BlasiChiara Francesca MagistraliValeria ToppiDavid RanucciRaffaella BranciariMaria Pia FranciosiniMDPI AGarticlebroiler chickenantimicrobial susceptibilitymicrodilution testcommensal <i>E. coli</i>organic systemantibiotic-free systemTherapeutics. PharmacologyRM1-950ENAntibiotics, Vol 10, Iss 1321, p 1321 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	broiler chicken antimicrobial susceptibility microdilution test commensal <i>E. coli</i> organic system antibiotic-free system Therapeutics. Pharmacology RM1-950
spellingShingle	broiler chicken antimicrobial susceptibility microdilution test commensal <i>E. coli</i> organic system antibiotic-free system Therapeutics. Pharmacology RM1-950 Laura Musa Patrizia Casagrande Proietti Maria Luisa Marenzoni Valentina Stefanetti Tana Shtylla Kika Francesca Blasi Chiara Francesca Magistrali Valeria Toppi David Ranucci Raffaella Branciari Maria Pia Franciosini Susceptibility of Commensal <i>E. coli</i> Isolated from Conventional, Antibiotic-Free, and Organic Meat Chickens on Farms and at Slaughter toward Antimicrobials with Public Health Relevance
description	The spread of resistant bacteria from livestock to the food industry promoted an increase of alternative poultry production systems, such as organic and antibiotic-free ones, based on the lack of antimicrobial use, except in cases in which welfare is compromised. We aimed to investigate the antibiotic susceptibility of commensal <i>E</i><i>scherichia c</i><i>oli</i> isolated from organic, antibiotic-free, and conventional broiler farms and slaughterhouses toward several antimicrobials critically important for human health. To assess antimicrobial susceptibility, all <i>E. coli</i> isolates and extended spectrum beta-lactamase (ESBL) <i>E. coli</i> were analysed by the microdilution method. The prevalence of tigecycline, azithromycin and gentamicin <i>E. coli</i>-resistant strains was highest in organic samplings. Conversely, the lowest prevalence of resistant <i>E. coli</i> strains was observed for cefotaxime, ceftazidime and ciprofloxacin in organic systems, representing a significant protective factor compared to conventional systems. All <i>E. coli</i> strains were colistin-susceptible. Contamination of the external environment by drug-resistant bacteria could play a role in the presence of resistant strains detected in organic systems. Of interest is the highest prevalence of cephalosporin resistance of <i>E. coli</i> in conventional samplings, since they are not permitted in poultry. Our results suggest that monitoring of antibiotic resistance of the production chain may be helpful to detect “risks” inherent to different rearing systems.
format	article
author	Laura Musa Patrizia Casagrande Proietti Maria Luisa Marenzoni Valentina Stefanetti Tana Shtylla Kika Francesca Blasi Chiara Francesca Magistrali Valeria Toppi David Ranucci Raffaella Branciari Maria Pia Franciosini
author_facet	Laura Musa Patrizia Casagrande Proietti Maria Luisa Marenzoni Valentina Stefanetti Tana Shtylla Kika Francesca Blasi Chiara Francesca Magistrali Valeria Toppi David Ranucci Raffaella Branciari Maria Pia Franciosini
author_sort	Laura Musa
title	Susceptibility of Commensal <i>E. coli</i> Isolated from Conventional, Antibiotic-Free, and Organic Meat Chickens on Farms and at Slaughter toward Antimicrobials with Public Health Relevance
title_short	Susceptibility of Commensal <i>E. coli</i> Isolated from Conventional, Antibiotic-Free, and Organic Meat Chickens on Farms and at Slaughter toward Antimicrobials with Public Health Relevance
title_full	Susceptibility of Commensal <i>E. coli</i> Isolated from Conventional, Antibiotic-Free, and Organic Meat Chickens on Farms and at Slaughter toward Antimicrobials with Public Health Relevance
title_fullStr	Susceptibility of Commensal <i>E. coli</i> Isolated from Conventional, Antibiotic-Free, and Organic Meat Chickens on Farms and at Slaughter toward Antimicrobials with Public Health Relevance
title_full_unstemmed	Susceptibility of Commensal <i>E. coli</i> Isolated from Conventional, Antibiotic-Free, and Organic Meat Chickens on Farms and at Slaughter toward Antimicrobials with Public Health Relevance
title_sort	susceptibility of commensal <i>e. coli</i> isolated from conventional, antibiotic-free, and organic meat chickens on farms and at slaughter toward antimicrobials with public health relevance
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/46e20edce9f245cfaa218c61dd57d67b
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Susceptibility of Commensal <i>E. coli</i> Isolated from Conventional, Antibiotic-Free, and Organic Meat Chickens on Farms and at Slaughter toward Antimicrobials with Public Health Relevance

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