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Article

Tracking the Prevalence of Antibiotic Resistance in Enterococcus Within the Spanish Poultry Industry: Insights from a One Health Approach

by
Josep Garcia-Llorens
1,2,
Isaac Monroy
1,
Jan Torres-Boncompte
1,2,
Jose M. Soriano
2,3,
Pablo Catalá-Gregori
1 and
Sandra Sevilla-Navarro
1,*
1
Centro de Calidad Avícola y Alimentación Animal de la Comunidad Valenciana (CECAV), 12539 Alquerias del Niño Perdido, Spain
2
Food & Health Lab, Institute of Materials Science, University of Valencia, 46980 Valencia, Spain
3
Joint Research Unit on Endocrinology, Nutrition and Clinical Dietetics, University of Valencia-Health Research Institute La Fe, 46026 Valencia, Spain
*
Author to whom correspondence should be addressed.
Antibiotics 2025, 14(1), 16; https://doi.org/10.3390/antibiotics14010016
Submission received: 4 December 2024 / Revised: 24 December 2024 / Accepted: 25 December 2024 / Published: 30 December 2024

Abstract

Background/Objectives: Antimicrobial resistance (AMR) in Enterococcus species from poultry production represents a significant public health threat due to the potential transmission of AMR through the food chain. This study aimed to examine the relative prevalence, resistance patterns, and mannitol fermentation capacity of Enterococcus isolates from various poultry production systems in Spain over a seven-year period (2017–2023). Methods: A total of 215 Enterococcus isolates were analyzed. Phenotypic assessments were conducted to determine resistance rates and metabolic capacities, while genotypic characterization focused on detecting vancomycin-resistance genes (vanA, vanB, vanC, and vanD). Results: Enterococcus faecalis (62.3%) and Enterococcus faecium (29.77%) were the predominant species, primarily isolated from broilers (74.88%), with the highest frequency observed in one-week-old chicks (31.16%). High resistance rates to tetracyclines and streptogramins were identified, while resistance to vancomycin (0.47%) and tigecycline (3.03%) was low. Interestingly, a significant reduction in tetracyclines resistance was shown in this period for Enterococcus faecalis (from 100% to 70% (2017–2023) and Enterococcus faecium (from 100% to 40% (2018–2023)). Multidrug resistance (MDR) was detected in 26.98% of isolates. Mannitol fermentation tests revealed high metabolic capacity in Enterococcus faecalis (99.25%) and Enterococcus faecium (96.88%), associated with adaptability and virulence potential. Genotypic analysis showed a very low prevalence of vanB and vanC genes. Conclusions: These findings highlight the critical need for targeted surveillance and intervention strategies in poultry production to mitigate the risks posed by MDR Enterococcus to public health.
Keywords: Enterococcus; antimicrobial resistance; surveillance; one health; poultry Enterococcus; antimicrobial resistance; surveillance; one health; poultry

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MDPI and ACS Style

Garcia-Llorens, J.; Monroy, I.; Torres-Boncompte, J.; Soriano, J.M.; Catalá-Gregori, P.; Sevilla-Navarro, S. Tracking the Prevalence of Antibiotic Resistance in Enterococcus Within the Spanish Poultry Industry: Insights from a One Health Approach. Antibiotics 2025, 14, 16. https://doi.org/10.3390/antibiotics14010016

AMA Style

Garcia-Llorens J, Monroy I, Torres-Boncompte J, Soriano JM, Catalá-Gregori P, Sevilla-Navarro S. Tracking the Prevalence of Antibiotic Resistance in Enterococcus Within the Spanish Poultry Industry: Insights from a One Health Approach. Antibiotics. 2025; 14(1):16. https://doi.org/10.3390/antibiotics14010016

Chicago/Turabian Style

Garcia-Llorens, Josep, Isaac Monroy, Jan Torres-Boncompte, Jose M. Soriano, Pablo Catalá-Gregori, and Sandra Sevilla-Navarro. 2025. "Tracking the Prevalence of Antibiotic Resistance in Enterococcus Within the Spanish Poultry Industry: Insights from a One Health Approach" Antibiotics 14, no. 1: 16. https://doi.org/10.3390/antibiotics14010016

APA Style

Garcia-Llorens, J., Monroy, I., Torres-Boncompte, J., Soriano, J. M., Catalá-Gregori, P., & Sevilla-Navarro, S. (2025). Tracking the Prevalence of Antibiotic Resistance in Enterococcus Within the Spanish Poultry Industry: Insights from a One Health Approach. Antibiotics, 14(1), 16. https://doi.org/10.3390/antibiotics14010016

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