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在圭亚那分离的A组链球菌对β-乳糖抗生素的敏感性降低
Melissa Kalladeen1, Paul Cheddie2, Patrick Eberechi Akpaka1
1Department of Paraclinical Sciences, University of the West Indies, St Augustine, Trinidad and Tobago.
Access microbiology
|July 24, 2024
概括
亚型链球菌 (GAS) 感染仍然对青素和阿莫西西林敏感. 然而,由于青素结合蛋白基因突变,一些菌株对塞法林的敏感性降低,需要持续监测.
科学领域:
- 微生物学 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:
- 甲型链球菌 (GAS) 引起各种感染,包括喉炎和严重的疾病,如死角膜炎.
- 尽管广泛使用,GAS仍然很容易受到β-乳酸抗生素的影响,尽管有报道减少了敏感性.
- 青素结合蛋白 (PBP) 基因的突变与GAS对抗生素敏感性降低有关.
研究的目的:
- 为了研究 GAS.的体外β-乳糖敏感性.
- 为了确定GAS分离体中药物耐药性的流行率.
- 识别与抗生素敏感性降低相关的PBP基因突变.
主要方法:
- 桑格测序被用来检测Streptococcus pyogenes的PBP基因中的突变.
- 隔离物从住院和门诊机构获得.
- 对抗生素敏感性测试使用E-测试条进行了对青素,阿莫西西林和塞法索林的测试.
主要成果:
- 在研究的GAS分离物中没有观察到对青素或氨基素的敏感性降低.
- 十三个GAS分离体对塞法林的敏感性降低.
- 在一些分离物中发现了突变,特别是pbp1a基因中的单氨基酸替代,可能会影响PBP 1A对塞法林的亲和力.
结论:
- 青素和相关的抗生素在治疗GAS感染方面仍然有效.
- 积极监测对于监测GAS中不断变化的抗生素敏感性模式至关重要.
- 了解耐药性的遗传机制对于有效的治疗策略至关重要.
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