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首页> 美国卫生研究院文献>Frontiers in Veterinary Science >Non-aureus Staphylococci Species in the Teat Canal and Milk in Four Commercial Swiss Dairy Herds
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Non-aureus Staphylococci Species in the Teat Canal and Milk in Four Commercial Swiss Dairy Herds

机译：瑞士四个奶牛场奶头渠和牛奶中的非金黄色葡萄球菌种类

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摘要

Non-aureus staphylococci (NAS) are frequently found in milk samples as well as on the teat apex and in the teat canal and are known to be a cause of subclinical mastitis. The objective of this study was to investigate the relationship between NAS species colonizing the teat canal and those causing intramammary infection (IMI) in four commercial dairy herds. Teat canal swabs were obtained and thereafter milk samples were aseptically collected and evaluated for the presence of staphylococci using selective agar plates. Species identification was performed using matrix-assisted laser desorption/ionization time–of–flight mass spectrometry. The relationship between NAS species distribution and sample type (teat canal vs. milk samples) was quantified using hierarchical multivariable logistic regression models. The most prevalent NAS species in teat canal swabs were S. xylosus (35%), S. vitulinus (10%), and S. chromogenes (7%), whereas in milk samples S. chromogenes (5%), S. xylosus (5%), and S. haemolyticus (4%) were most prevalent. There were significantly higher odds for S. vitulinus (OR = 215), S. xylosus (OR = 20), S. sciuri (OR = 22), S. equorum (OR = 13), and S. succinus (OR = 10) to be present in teat canal swabs than in milk samples. Differences between herds in NAS species distribution were found and were most pronounced for S. succinus and a S. warneri-like species. This information aids in the understanding of NAS species as an etiology of IMI and should be taken into account when interpreting milk culture results.
机译：非金黄色葡萄球菌（NAS）经常在牛奶样本以及乳头顶点和乳头管中发现，并且已知是亚临床乳腺炎的病因。这项研究的目的是调查在四个奶牛场中，定居在乳头管中的NAS物种与引起乳内感染（IMI）的物种之间的关系。获得乳头拭子，然后无菌收集牛奶样品，并使用选择性琼脂平板评估葡萄球菌的存在。使用基质辅助激光解吸/电离飞行时间质谱进行物种鉴定。 NAS物种分布与样品类型（大运河与牛奶样品）之间的关系使用分层多变量Logistic回归模型进行了定量。奶嘴拭子中最普遍的NAS物种是木糖链球菌（35％），玻璃藻链球菌（10％）和发色链球菌（7％），而牛奶样品中的发色链球菌（5％），木糖链球菌（5％）和溶血链球菌（4％）最为流行。葡萄球菌（OR = 215），木糖链球菌（OR = 20），葡萄球菌（OR = 22），木贼链球菌（OR = 13）和琥珀酵母（OR = 10）的可能性更高）比奶样中的奶头拭子要多。发现在NAS物种分布中的畜群之间的差异，其中最明显的是S. succinus和S. warneri样的物种。此信息有助于将NAS物种理解为IMI的病因，在解释牛奶培养结果时应考虑到这一信息。

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