Competing microorganisms with exclusion effects against multidrug-resistant Salmonella Infantis in chicken litter supplemented with growth-promoting antimicrobials.

IF 2 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Veterinary World Pub Date : 2025-05-01 Epub Date: 2025-05-13 DOI:10.14202/vetworld.2025.1127-1136
María Alejandra Ospina Barrero, Maryeimy Varón-López, Lina M Peñuela-Sierra
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引用次数: 0

Abstract

Background and aim: The widespread use of antibiotic growth promoters (AGPs) in poultry production has been implicated in altering gut microbiota and promoting the excretion of multidrug-resistant (MDR) bacteria into the environment. Salmonella enterica serovar Infantis (Salmonella Infantis [S.I]), a prevalent zoonotic pathogen, has demonstrated increasing resistance in poultry systems. This study aimed to evaluate the efficacy of natural control microorganisms (NCM), Bacillus subtilis and Lactobacillus plantarum, in reducing the abundance of MDR S.I in fresh chicken litter from birds raised with or without AGP supplementation. It also examined how physicochemical properties and microbial dynamics influence pathogen persistence.

Materials and methods: Microcosms were constructed using litter from broilers raised under two dietary regimes (with and without avilamycin). Treatments included combinations of AGP, S.I, and NCM. Bacterial enumeration was performed using selective media, and whole-genome sequencing of S.I was conducted to characterize antimicrobial resistance and virulence genes. Physicochemical parameters (pH, humidity, temperature, and ammonia) were measured and correlated with microbial loads. Antagonistic activity of NCM strains was assessed using agar diffusion assays.

Results: Genome analysis revealed that S.I carried multiple resistance genes (e.g., blaCTX-M-65, tet(A), and sul1) and efflux systems conferring MDR. In vitro assays showed strong antagonism by L. plantarum and moderate activity by B. subtilis. In microcosms, S.I counts significantly decreased in the presence of both AGP and NCM, indicating synergistic inhibition. Conversely, in the absence of AGP, NCM had a limited effect. Statistical analyses showed strong correlations between microbial groups and physicochemical variables, particularly during later production stages.

Conclusion: The application of B. subtilis and L. plantarum in chicken litter significantly reduced S.I colonization under AGP supplementation, suggesting their potential as biocontrol agents. These findings support the development of integrated litter management strategies to mitigate zoonotic and resistant pathogen dissemination, particularly in AGP-using systems. However, the effectiveness of such interventions may vary across farms due to differences in microbial ecology and environmental conditions.

在添加促生长抗菌剂的鸡窝中,对多药耐药婴儿沙门氏菌具有排斥作用的竞争微生物。
背景与目的:抗生素生长促进剂(AGPs)在家禽生产中的广泛使用与改变肠道微生物群和促进多重耐药(MDR)细菌排泄到环境中有关。婴儿肠血清型沙门氏菌(沙门氏菌[si])是一种流行的人畜共患病原体,在家禽系统中显示出越来越强的耐药性。本研究旨在评价天然防治微生物(NCM)、枯草芽孢杆菌和植物乳杆菌对添加或不添加AGP饲养的雏鸡鲜窝中MDR S.I丰度的影响。它还研究了物理化学性质和微生物动力学如何影响病原体的持久性。材料和方法:采用两种饲粮(含和不含阿维霉素)下饲养的肉鸡的窝产仔构建微观世界。治疗包括AGP、S.I和NCM联合治疗。采用选择性培养基进行细菌计数,并对S.I进行全基因组测序,以表征其耐药性和毒力基因。测量了理化参数(pH、湿度、温度和氨)并与微生物负荷相关。采用琼脂扩散法测定NCM菌株的拮抗活性。结果:基因组分析显示,S.I携带多种耐药基因(如blaCTX-M-65、tet(A)和sul1)和导致耐多药的外排系统。体外实验表明,植物乳杆菌具有较强的拮抗作用,枯草芽孢杆菌具有中等拮抗作用。在微观环境中,AGP和NCM同时存在时,S.I计数显著减少,表明协同抑制作用。相反,在没有AGP的情况下,NCM的作用有限。统计分析表明,微生物群与理化变量之间存在很强的相关性,特别是在生产后期。结论:在添加AGP的鸡窝中添加枯草芽孢杆菌和植物乳杆菌可显著减少S.I的定植,提示它们具有作为生物防治剂的潜力。这些发现支持制定综合凋落物管理战略,以减轻人畜共患和耐药病原体的传播,特别是在使用agp的系统中。然而,由于微生物生态和环境条件的差异,这些干预措施的有效性可能因农场而异。
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来源期刊
Veterinary World
Veterinary World Multiple-
CiteScore
3.60
自引率
12.50%
发文量
317
审稿时长
16 weeks
期刊介绍: Veterinary World publishes high quality papers focusing on Veterinary and Animal Science. The fields of study are bacteriology, parasitology, pathology, virology, immunology, mycology, public health, biotechnology, meat science, fish diseases, nutrition, gynecology, genetics, wildlife, laboratory animals, animal models of human infections, prion diseases and epidemiology. Studies on zoonotic and emerging infections are highly appreciated. Review articles are highly appreciated. All articles published by Veterinary World are made freely and permanently accessible online. All articles to Veterinary World are posted online immediately as they are ready for publication.
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