Antibiotic-resistant commensal Escherichia coli are less frequently isolated from poultry raised using non-conventional management systems than from conventional broiler

Pesciaroli, Michele; Magistrali, Chiara Francesca; Filippini, G.; Epifanio, Ersilia Maria; Lovito, Carmela; Marchi, Lucia; Maresca, Carmen; Massacci, Francesca Romana; Orsini, Serenella; Scoccia, Eleonora; Tofani, Silvia; Pezzotti, Giovanni

doi:10.1016/j.ijfoodmicro.2019.108391

Cited by 37 publications

(44 citation statements)

References 25 publications

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“…An additional topic of interest is that organic and pastured poultry broilers are both reared antibiotic-free, which could potentially affect the antimicrobial resistance (AR) profile and antibiotic resistance genes (ARG) of the Salmonella populations along the farm-to-fork continuum. There have been conflicting results from studies comparing the abundance of AR foodborne pathogens and ARG in antibiotic-free vs. conventional broiler farms (Sapkota et al, 2011;Zhang et al, 2011;Millman et al, 2013;Garcia and Teixeira, 2017;Davis et al, 2018;Rovira et al, 2019;Pesciaroli et al, 2020). Given the recent decline in clinically important antibiotics due to the rapid appearance of Abbreviations: AR, antimicrobial resistant; ARG, antibiotic resistance genes; MDR, multidrug resistant; WCR, whole carcass rinse.…”

Section: Introductionmentioning

confidence: 99%

Salmonella Diversity Along the Farm-to-Fork Continuum of Pastured Poultry Flocks in the Southeastern United States

2021

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Greater consumer demand for all natural, antibiotic-free poultry products has led to an increase in pastured poultry operations. Given the increased level of environmental interaction, and the potential increase in exposure to foodborne pathogens, a greater understanding of the prevalence and diversity of Salmonella populations inherent within pastured poultry flocks. To achieve this, 42 pastured poultry flocks from 11 farms were sampled using a farm-to-fork strategy and Salmonella was isolated and characterized through pre-harvest (feces, soil) to post-harvest (ceca, whole carcass rinse) to the final product (whole carcass rinse) the consumer would purchase. Salmonella was isolated from 353 of a total of 2,305 samples, representing an overall prevalence of 18.1%. By far the most prevalent serotype was Kentucky (72.7% of all isolates), with <16% of all Salmonella representing a top serotype of concern for human health according to the CDC. Even though these flocks were raised antibiotic-free, Salmonella isolates exhibited resistances to a variety of antibiotics, with the two most common resistances being toward tetracycline and streptomycin (68.8 and 64.4% of all isolates, respectively); however, almost 98% of the multidrug resistant isolates were serotype Kentucky. Salmonella prevalence and diversity (both in terms of serotypes and antibiotic resistance profiles) were related more to the farm location than to the type of sample from which the Salmonella was isolated from along the farm-to-fork continuum. Based on these data, while Salmonella prevalence was similar to that from conventional poultry operations, serotypes of lesser concern to human health (Kentucky, Indiana) tended to fill the ecological niche for Salmonella species throughout the farm-to-fork continuum in these pastured poultry flocks. The diversity of these Salmonella populations tended to be farm specific, indicating the need for more tailored intervention strategies to continue to enhance the safety of these products.

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Section: Introductionmentioning

confidence: 99%

Salmonella Diversity Along the Farm-to-Fork Continuum of Pastured Poultry Flocks in the Southeastern United States

2021

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“…Moreover, the diffusion of ESBL could result in unsuccessful therapeutic treatment in human infections and also require the use of “last resort antibiotics” (e.g., carbapenems) causing an increased resistance to these antibiotic classes [ 27 , 28 ]. In this scenario, poultry producers have turned to alternative production systems, such as organic (O) and antibiotic-free (AF) farming, based on the lack of antimicrobial use, unless animal welfare is at risk [ 29 ]. In our work, we aimed to investigate the antibiotic susceptibility of commensal E. coli , especially towards antimicrobials used in human therapy, isolated in organic, antibiotic-free and conventional (C) broilers on farms and at slaughter.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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 Escherichia coli isolated from organic, antibiotic-free, and conventional broiler farms and slaughterhouses toward several antimicrobials critically important for human health. To assess antimicrobial susceptibility, all E. coli isolates and extended spectrum beta-lactamase (ESBL) E. coli were analysed by the microdilution method. The prevalence of tigecycline, azithromycin and gentamicin E. coli-resistant strains was highest in organic samplings. Conversely, the lowest prevalence of resistant E. coli strains was observed for cefotaxime, ceftazidime and ciprofloxacin in organic systems, representing a significant protective factor compared to conventional systems. All E. coli 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 E. coli 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.

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“…Currently, the use of antibiotics in poultry farming for microbiological process control is increasingly considered as a negative practice that deteriorates the final product quality [1,2]. Various additives -phytobiotics, prebiotics, probiotics, acidifiers, etc., are proposed as an alternative, including to enhance productivity [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of compound feed acidification on the body weight gain of quails on mini-farms

2020

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The article presents the study results on the fattening effectiveness of Texas Broiler quails using the formulated feed with “B.I.O. Acid Ultra” acidifier. Space and layout design of the mini-farm allowed to house 1000 head of the main flock and up to 300 young birds. The inside climate system of the mini-farm maintained the temperature in the range of 18 °C -20 °C and 75% humidity. In the study, 250 head of daily chicks were randomly selected and divided into 5 groups of 50 head each – one control group and four experimental ones. The study lasted for 8 weeks, i.e. the meat quail fattening period. The addition of the acidifier to the diet in the amount of 0.23% was found to result in 9.0% increase in the bodyweight of the 8-week old quails. The average daily weight increments also increased during the entire fattening period. The use of the acidifier reduced the feed conversion ratio by 4.1% – 6.79 versus 7.1 in the control group. However, the effect of different acidifiers on the effectiveness of quail fattening and the organoleptic and other quality indicators of the quail meat requires further comparative inquiry.

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Antibiotic-resistant commensal Escherichia coli are less frequently isolated from poultry raised using non-conventional management systems than from conventional broiler

Cited by 37 publications

References 25 publications

Salmonella Diversity Along the Farm-to-Fork Continuum of Pastured Poultry Flocks in the Southeastern United States

Salmonella Diversity Along the Farm-to-Fork Continuum of Pastured Poultry Flocks in the Southeastern United States

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

Effect of compound feed acidification on the body weight gain of quails on mini-farms

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