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在南非自由邦省使用基质辅助激光解吸电离飞行时间质谱(MALDI-TOF MS)、聚合酶链反应(PCR)和测序技术检测亚临床型乳腺炎奶牛乳汁中的分离株及其抗菌药物耐药谱和毒力基因

Detection of Isolates and Their Antimicrobial Resistance Profiles and Virulence Genes from Subclinical Mastitis Cattle Milk Using MALDI-TOF MS, PCR and Sequencing in Free State Province, South Africa.

作者信息

Khasapane Ntelekwane G, Koos Myburgh, Nkhebenyane Sebolelo J, Khumalo Zamantungwa T H, Ramatla Tsepo, Thekisoe Oriel

机构信息

Centre for Applied Food Safety and Biotechnology, Department of Life Sciences, Central University of Technology, 1 Park Road, Bloemfontein 9300, South Africa.

Department of Animal Sciences, Faculty of Natural and Agricultural Sciences, University of the Free State, Bloemfontein 9300, South Africa.

出版信息

Animals (Basel). 2024 Jan 2;14(1):154. doi: 10.3390/ani14010154.

Abstract

species are amongst the bacteria that cause bovine mastitis worldwide, whereby they produce a wide range of protein toxins, virulence factors, and antimicrobial-resistant properties which are enhancing the pathogenicity of these organisms. This study aimed to detect spp. from the milk of cattle with subclinical mastitis using MALDI-TOF MS and 16S rRNA PCR as well as screening for antimicrobial resistance (AMR) and virulence genes. Our results uncovered that from 166 sampled cows, only 33.13% had subclinical mastitis after initial screening, while the quarter-level prevalence was 54%. Of the 50 cultured bacterial isolates, MALDI-TOF MS and 16S rRNA PCR assay and sequencing identified as the dominant bacteria by 76%. Furthermore, an AMR susceptibility test showed that 86% of the isolates were resistant to penicillin, followed by ciprofloxacin (80%) and cefoxitin (52%). Antimicrobial resistance and virulence genes showed that 16% of the isolates carried the gene, while 52% of the isolates carried the -binding region gene, followed by (42%), (40%), (38%), and (38%), whereas and genes were detected in 10% and 2% of the isolates, respectively. The occurrence of virulence factors and antimicrobial resistance profiles highlights the need for appropriate strategies to control the spread of these pathogens.

摘要

该物种是全球范围内引起牛乳腺炎的细菌之一,它们会产生多种蛋白质毒素、毒力因子和抗菌抗性特性,这些特性增强了这些生物体的致病性。本研究旨在使用基质辅助激光解吸电离飞行时间质谱(MALDI-TOF MS)和16S rRNA聚合酶链反应(PCR)从患有亚临床乳腺炎的奶牛乳汁中检测该物种,并筛选抗菌抗性(AMR)和毒力基因。我们的结果发现,在166头采样奶牛中,初步筛查后只有33.13%患有亚临床乳腺炎,而乳房四分位患病率为54%。在50株培养的细菌分离株中,MALDI-TOF MS、16S rRNA PCR检测和测序确定该物种为优势菌,占76%。此外,抗菌药物敏感性试验表明,86%的分离株对青霉素耐药,其次是环丙沙星(80%)和头孢西丁(52%)。抗菌抗性和毒力基因检测显示,16%的分离株携带该基因,52%的分离株携带结合区域基因,其次是(42%)、(40%)、(38%)和(38%),而和基因分别在10%和2%的分离株中检测到。毒力因子的出现和抗菌抗性谱突出了需要采取适当策略来控制这些病原体的传播。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2554/10778211/7393ef4ace83/animals-14-00154-g001.jpg

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