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Updated: Feb 4, 2026

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QAcA是从肺炎患者中分离出来的5型甲基西林耐药Staphylococcus aureus异构菌中对ванкомицин异构抵抗的一个关键因素

Kaiting Zhang¹, Lin Xi¹, Qiyu Bian¹

¹Institute of Antibiotics, Key Laboratory of Clinical Pharmacology of Antibiotics, National Population and Family Planning Commission & National Clinical Research Center for Aging and Medicine, Huashan Hospital, Fudan University, Shanghai, China.

Microbiology spectrum

|February 2, 2026

概括

在MRSA肺炎中,异质的菌素中间体黄金葡萄球菌 (hVISA) 是常见的. 香敏黄金菌 (VSSA) 获得的排泄基因qacA将菌株转化为hVISA,影响香的疗效.

科学领域:

医学微生物学医学微生物学
传染性疾病传染性疾病
抗微生物耐药性抗微生物耐药性

背景情况:

甲素耐药黄金葡萄球菌 (MRSA) 导致严重的肺部感染,而万科米辛是主要治疗方法.
增加的香素使用与香素中间体黄金色细菌 (VISA) 和异质VISA (hVISA) 菌株的流行率上升相关.
了解MRSA肺炎中hVISA的分子基础对于有效的治疗策略至关重要.

研究的目的:

研究来自肺炎患者的MRSA菌株中与hVISA相关的分子特征和风险因素.
确定hVISA发展的预测因子,特别是在主导序列5型 (ST5) -MRSA中.
通过实验证实减少万科胺素敏感性的遗传决定因素来验证发现.

主要方法:

来自肺炎患者的MRSA分离物的前性多中心观察研究 (2012年7月至2020年6月).
使用修改的人口分析概况-曲线下面积 (PAP-AUC) 方法识别的hVISA菌株.
多变量后勤回归分析和基于等离子体的实验,以识别和确认遗传风险因素.

主要成果:

在肺炎患者的MRSA分离物中,hVISA的患病率为53.5% (61/114).
序列5型 (ST5) -MRSA是主导的hVISA菌株,而ST764-MRSA是主导的香草素敏感的黄金菌株 (VSSA).
排泄基因qacA被确定为ST5-MRSA中hVISA的显著独立预测因子 (P < 0.001),通过表型转换实验得到证实.

结论:

通过VSSA菌株获得qacA基因与肺炎患者MRSA分离物中hVISA的发展密切相关.
这些发现提供了对MRSA肺炎中明素敏感性降低的见解.
这项研究支持优化临床治疗计划,以保持万科米辛对MRSA感染的疗效.

关键词:

ST5 ST5 ST5 ST5 ST5 ST5 ST5 ST5 ST5 ST5 ST5 ST5 ST5 ST5 不同质的万科米辛中间体金黄色菌.这就是为什么QacAA.这就是Vancomycin.

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