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参与农场员工抗菌药物管理教育项目的奶牛场中产肠杆菌的耐药性。

Antimicrobial resistance of Escherichia coli from dairy farms participating in an antimicrobial stewardship educational program for farm employees.

机构信息

Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, Davis, CA 95616.

Department of Veterinary Preventive Medicine, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210.

出版信息

J Dairy Sci. 2024 Mar;107(3):1645-1655. doi: 10.3168/jds.2023-23574. Epub 2023 Oct 6.

Abstract

Antimicrobial use in food-producing animals is under increasing scrutiny due to the potential effect on the selection of antimicrobial-resistant bacteria that may be transmitted to humans by direct contact, with the food chain, or the environment. Novel data monitoring commensal Escherichia coli from dairy farms is essential for understanding antimicrobial resistance (AMR) patterns and their association with herd health management practices. The objectives of this study were to: (1) compare the prevalence of antimicrobial resistance in the E. coli isolates from the hospital, fresh, and mid-lactation pens from 18 conventional dairy farms participating in an educational training program in antimicrobial stewardship practices in California and Ohio, and (2) to characterize the prevalence of antimicrobial resistance of commensal E. coli isolated from pooled fecal pat samples before and 3 mo after participating in the educational training program. Pooled fecal pat samples were collected from the hospital pen, the fresh pen (1 to 5 DIM), and the mid-lactation pens (90 to 150 DIM) on conventional dairies in CA (n = 9) and OH (n = 9). Fecal samples were collected as part of a larger study using a quasi-experimental design that assigned farms to the training intervention group (TG; 6 per state) or the control group (CG; 3 per state). For the TG, farm worker(s) identified as having the task of diagnosis and treatment of adult cows on the farm participated in a training program on antimicrobial stewardship practices. Pooled fecal samples (n = 7) were collected at enrollment and 3 mo after completing the intervention on each of the participating farms (n = 18), followed by culture for E. coli isolation and antimicrobial sensitivity testing using the broth microdilution methodology. Logistic regression models were used to evaluate the association between E. coli antimicrobial resistance patterns with the training intervention and farm-level factors. No effect was observed in the prevalence of resistant isolates between the control and intervention farms after the training was delivered. Isolates from the hospital pens were 2.48 (95% CI: 1.06-6.22, P = 0.03) and 5.61 (95% CI: 1.94-16.91, P < 0.001) times, more likely to be resistant to streptomycin and chloramphenicol, respectively, than isolates from the mid-lactation pens. Our findings indicate there was a higher prevalence of AMR in E. coli associated with the hospital pen within the farm, while the training program for 3 mo did not affect the prevalence of AMR in E. coli on the farms participating in the program. Further research efforts should be conducted to identify factors driving AMR at the pen level, as well as approaches that could be used to reduce the risk of disseminating AMR from sick pens to animals being housed and to other pens on the farm.

摘要

由于食品生产动物中抗菌药物的使用可能会对选择可能通过直接接触、食物链或环境传播给人类的抗菌药物耐药菌产生影响,因此人们对其的关注度日益增加。从奶牛场监测共生大肠杆菌的新数据对于了解抗菌药物耐药性 (AMR) 模式及其与畜群健康管理实践的关系至关重要。本研究的目的是:(1) 比较参与加利福尼亚州和俄亥俄州抗菌药物管理实践教育培训计划的 18 个常规奶牛场的医院、新鲜和泌乳中期畜栏中大肠杆菌分离株的抗菌药物耐药率;(2) 描述在参与教育培训计划前后,从常规奶牛场的医院畜栏、新鲜畜栏(1-5 天泌乳期)和泌乳中期畜栏(90-150 天泌乳期)采集的混合粪便样本中分离出的共生大肠杆菌的抗菌药物耐药率。在加利福尼亚州 (n = 9) 和俄亥俄州 (n = 9) 的常规奶牛场,从医院畜栏、新鲜畜栏 (1-5 天泌乳期) 和泌乳中期畜栏 (90-150 天泌乳期) 采集混合粪便样本。粪便样本是使用准实验设计采集的,该设计将农场分配到培训干预组 (TG;每个州 6 个) 或对照组 (CG;每个州 3 个)。对于 TG,农场工人 (被指定为有诊断和治疗农场成年牛任务的人) 参加了抗菌药物管理实践培训计划。在每个参与农场 (n = 18) 的干预完成后 3 个月,对 TG 进行了培训,随后进行了混合粪便样本采集 (n = 7),并使用肉汤微量稀释法进行大肠杆菌分离和抗菌药物敏感性试验。使用逻辑回归模型评估大肠杆菌抗菌药物耐药模式与培训干预和农场水平因素之间的关联。培训后,对照组和干预组农场之间分离株的耐药率没有观察到影响。与泌乳中期畜栏相比,医院畜栏的分离株对链霉素和氯霉素的耐药率分别高出 2.48 倍 (95%CI:1.06-6.22,P = 0.03) 和 5.61 倍 (95%CI:1.94-16.91,P < 0.001)。我们的研究结果表明,在农场内,与泌乳中期畜栏相比,医院畜栏中与大肠杆菌相关的 AMR 发生率更高,而为期 3 个月的培训计划并没有影响参与该计划的农场中大肠杆菌的 AMR 发生率。应进一步开展研究工作,以确定畜栏水平 AMR 的驱动因素,以及可用于降低耐药菌从患病畜栏传播给畜栏中动物和其他畜栏的风险的方法。

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