从临床材料中分离出来的 Staphylococcus hominis 中多药耐药性的流行
Magdalena Szemraj1, Paulina Glajzner2, Kamila Olszowiec3
1Department of Pharmaceutical Microbiology and Microbiological Diagnostic, Medical University of Lodz, Łódź, Poland. magdalena.szemraj@umed.lodz.pl.
Scientific reports
|January 2, 2025
概括
人类葡萄球菌 (Staphylococcus hominis) 的抗生素耐药性日益令人担忧,大多数菌株表现出多种耐药性和独特的耐药性基因组合. 这些细菌构成威胁,并可能将耐药性基因转移到其他病原体.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 由于抗生素耐药性增加,葡萄球菌人类感染很难治疗.
- 了解这种耐药性的遗传基础对于有效的治疗策略至关重要.
研究的目的:
- 为了确定从临床样本中分离的S. hominis菌株的抗生素耐药性模式.
- 确定这些菌株抗生素耐药性背后的分子机制.
主要方法:
- 对62种S. hominis菌株进行了抗生素敏感性测试.
- 使用分子方法检测特定的抗生素耐药性基因,包括mecA,tetK,erm(C等.
- 进行了mec和ccr复杂组合的分析.
主要成果:
- 超过80%的菌株具有多药耐药性,12种菌株对至少7种抗生素具有耐药性.
- 46个菌株对甲基西林有耐药性,它们携带了mecA基因.
- 观察到 mec 和 ccr 复合物的独特组合,并确定了各种抗性基因 (tetK,acc6') -Ie aph2'),ant4' -I,ermC),msrA,msrB,mphC,lnuA,vga).
- 在一些菌株中,注意到对万科米辛的敏感性降低和异质耐药性.
结论:
- 由于其多药性耐药性,S. hominis 构成了越来越大的威胁.
- 这些细菌可以作为抗生素耐药性基因的储存库,可能将它们转移到更病原性细菌中.
- 鉴定到的独特的抗药性基因组合突显了持续监测和新的治疗方法的必要性.
相关概念视频
Mismatch Repair
38.1K
Overview
38.1K
Defense Against Bacterial Pathogens
3.0K
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
3.0K
Development 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
Staphylococcal Skin Infections
143
Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
143
Mechanism 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
Clinical 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


