基因组进化和多药耐药Clostridioides difficileRT027克隆的重新出现,具有减少的万科素敏感性,导致长期的医院爆发
Joana Isidro1, Filipa Dionísio2, Frederico Alves2
1Genomics and Bioinformatics Unit, Department of Infectious Diseases, National Institute of Health Doutor Ricardo Jorge (INSA), Lisboa, Portugal.
Emerging microbes & infections
|March 3, 2026
概括
一种具有多药性耐药性Clostridioides difficile (C. difficile) RT027菌株,具有降低的香素敏感性,在葡萄牙引起了长达15个月的疫情. 这凸显了抗菌素耐药性的不断发展以及加强监测的必要性.
科学领域:
- 传染性疾病 传染性疾病
- 基因组学就是基因组学.
- 流行病学 流行病学
背景情况:
- 葡萄牙的流行病Clostridioides difficile ribotype 027 (RT027) 的流行率呈现下降趋势.
- 一种具有遗传特异性的多药耐药 (MDR) RT027菌株出现了,具有降低的万科素敏感性.
- 这种菌株在一家三级医院造成了15个月的重大疫情.
研究的目的:
- 提供流行病学和基因组证据,证明这种高风险的C. difficile血统的新循环和进化适应.
- 描述疫情克隆,了解传播动态.
- 评估新兴菌株的抗菌素耐药性和万科胺素敏感性.
主要方法:
- 进行全面的疫情调查,包括流行病学和临床数据分析.
- 对抗微生物暴露和感染控制措施的分析.
- 全基因组测序 (WGS) 用于表征C. difficile疫情克隆.
主要成果:
- 确认了66例C. difficile感染 (CDI) 病例,发病率在2024年4月达到顶峰.
- WGS揭示了AMR决定因素的积累,从而赋予了一个广泛的MDR表型.
- 所有分离物都含有VanR T115A的替代物,这与减少菌素敏感性和高复发率 (25%) 相关.
结论:
- 长期爆发的疫情记录了高病毒性RT027血统的重新出现和基因组演变.
- 该菌株表现出有关抗菌素耐药性的扩张和降低菌素敏感性的症状.
- 调查结果强调需要加强对C. difficile的监测,基因组监测和感染预防策略.
相关概念视频
00:57Antibiotic Selection
48.9K
Overview
48.9K
01:30Development of Antibiotic Resistance
2.0K
Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
2.0K
01:24Evolution of New Traits in Microbes
199
Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
199
01:18Bacterial Gastroenteritis
88
Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid...
88
01:25Mechanism of Antibiotic Resistance in MRSA
219
Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and...
219
01:25Clinical Significance of Antibiotic Resistance
90
Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within...
90