小母牛将一种新的亚型引入持续的金黄色葡萄球菌乳腺内感染的牛群。

IF 1.6 3区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Journal of Dairy Research Pub Date : 2024-11-01 Epub Date: 2025-05-19 DOI:10.1017/S0022029925000202
Joaquin Cicotello, Nasrin Ramezanigardaloud, Camila Miotti, Ana Inés Molineri, Tom Grunert, Guillermo Suarez Archilla, Luis Fernando Calvinho, Cecilia M Camussone
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引用次数: 0

摘要

本研究描述了在分娩前自然感染金黄色葡萄球菌并引入该生物高流行率的牛群的母牛的第一次哺乳期乳腺内感染(IMI)的传播。在母牛第一次哺乳期间对其进行监测,以确定IMI的潜在传播和持久性,并确定引起IMI的分离株的特征。在研究开始时和一年后,从哺乳期牛群的所有奶牛中采集牛奶样本。利用脉冲场凝胶电泳(PFGE)、多位点序列分型和傅里叶变换红外光谱技术,将这两次采样时间分离的金黄色葡萄球菌与从小母牛中获得的金黄色葡萄球菌进行比较,分析它们的克隆关系和系统发育关系。大多数从分娩前母牛的乳腺分泌物中分离的金黄色葡萄球菌在第一次哺乳期间建立了慢性IMI。PFGE分型区分出3个与分离株来源、泌乳次数和克隆复合体相关的聚类。在感染乳牛的主要脉冲型和发生持续性IMI的小母牛的脉冲型中,检测到与毒力决定因素相关的基因的存在和表达的差异,这表明产生IMI的适应能力不同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Heifers introduced a new subtype into a herd with persistent Staphylococcus aureus intramammary infections.

This study describes the spread of intramammary infections (IMI) during the first lactation of heifers that were naturally infected with Staphylococcus aureus before parturition and introduced into a herd with a high prevalence of this organism. The heifers were monitored during their first lactation to determine potential spread and persistence of IMI and to characterize the isolates that caused IMI. Milk samples were obtained from all the cows in the lactating herd at the beginning of the study and one year later. S. aureus isolated at both these sampling times were compared with those obtained from the heifers to analyse their clonal and phylogenetic relationships, employing pulse-field gel electrophoresis (PFGE), multi-locus sequence typing and Fourier transform infrared spectroscopy. Most S. aureus isolated from mammary secretions of heifers before parturition established chronic IMI during the first lactation. PFGE typing discriminated 3 clusters that were associated with origin of isolates, number of lactations and clonal complex. Differences both in the presence and expression of genes associated with virulence determinants among the major pulsotypes infecting lactating cows and those from heifers that developed persistent IMI were detected, which are indicative of distinct adaptive capacities to generate IMI.

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来源期刊
Journal of Dairy Research
Journal of Dairy Research 农林科学-奶制品与动物科学
CiteScore
3.80
自引率
4.80%
发文量
117
审稿时长
12-24 weeks
期刊介绍: The Journal of Dairy Research is an international Journal of high-standing that publishes original scientific research on all aspects of the biology, wellbeing and technology of lactating animals and the foods they produce. The Journal’s ability to cover the entire dairy foods chain is a major strength. Cross-disciplinary research is particularly welcomed, as is comparative lactation research in different dairy and non-dairy species and research dealing with consumer health aspects of dairy products. Journal of Dairy Research: an international Journal of the lactation sciences.
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