来自南非三个省份的临床便样本中分离的Clostridioides difficile高病毒性ST1菌株
Hlambani Shirinda1, Anthony M Smith2, Ben Prinsloo3
1Department of Medical Microbiology, University of Pretoria, Pretoria, South Africa.
Anaerobe
|November 30, 2024
概括
在南非发现了高病毒性Clostridioides difficile菌株,包括ST1和ST11. 分子流行病学揭示了正在发生的ST1疫情,强调了加强对这种严重的医疗相关感染的监测的必要性.
科学领域:
- 医学微生物学 医学微生物学
- 基因组学就是基因组学.
- 流行病学 流行病学
背景情况:
- 困难菌感染 (CDI) 是一个重要的医疗相关感染.
- 抗菌剂的使用是CDI的主要风险因素.
- 过度病毒性菌株,如RT027,与严重疾病有关.
研究的目的:
- 调查南非C. difficile分离体的分子流行病学.
- 来自公共和私人医疗机构的C. difficile菌株的基因组特征的特征.
- 为了识别高病毒性C. difficile菌株的存在.
主要方法:
- 使用多重聚合酶链反应 (M-PCR) 培养和识别了临床便样本.
- 使用M-PCR进行了毒素基因检测.
- 全基因组测序 (WGS) 用于基因组表征.
- 数据分析使用pubMLST,EnteroBase,病原体观察和CARD.
主要成果:
- 62%的标本产生了确定的C. difficile分离物,其中97%具有毒性.
- 主导的毒素概况是A+B+CDT+.
- WGS揭示了16种序列类型 (ST),其中ST1 (RT027相关) 是最常见的 (45%).
- 高省的一个ST1集群显示出一致的抗体.
- 还确定了ST11 (动物性潜在) 和ST37 (流行性) 菌株.
- 公共医疗隔离显示出基因相似性,而私人医疗隔离显示出更大的多样性.
结论:
- 超病毒性ST1和ST11菌株首次在南非被发现.
- 有证据表明,高省正在发生ST1疫情.
- 这些发现强调了南非C. difficile分子监测的重要性.
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