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Healthcare Associated Infections I: Iatrogenic, Exogenic and Endogenic01:26

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Healthcare-associated infections (HAIs) occur in a healthcare facility while a person receives care for another ailment. This category also includes work-related infections among healthcare staff.
HAIs significantly increase the cost of health care. Extended stays in healthcare institutions, increased disability, increased costs of medications, including specialized antibiotics, and prolonged recovery times add to the patient's expenses and the healthcare institution and funding bodies.
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Healthcare Associated Infections II: Preventive Measures01:22

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Essential infection prevention measures are based on the knowledge of the infection chain, the modes of transmission in healthcare settings, and the use of the best practices in all healthcare settings. Compulsory public reporting of healthcare-associated infection rates is needed to allow individuals and the community to make informed choices regarding selecting a healthcare facility.
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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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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
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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...
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Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism of Antibiotic Resistance in MRSA

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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...
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Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

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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...
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在一个美国印第安人社区的农村地区,社区获得的抗甲素的金黄色葡萄球菌 (Staphylococcus aureus).

A V Groom1, D H Wolsey, T S Naimi

  • 1Indian Health Service National Epidemiology Program, 5300 Homestead Rd NE, Albuquerque, NM 87110, USA.

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|September 18, 2001
PubMed
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社区获得的甲素耐药黄金葡萄球菌 (MRSA) 感染正在农村地区出现,可能取代对甲素敏感的黄金葡萄球菌 (MSSA). 这项研究记录了农村美洲印第安人社区社区MRSA发生情况和风险因素.

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科学领域:

  • 传染性疾病 传染性疾病
  • 流行病学 流行病学
  • 微生物学 微生物学

背景情况:

  • 长期以来,耐甲基西林黄金葡萄球菌 (MRSA) 与医疗保健机构有关.
  • 最近在健康儿童中发生的严重MRSA感染表明,社区获取正在增加.
  • 这项研究调查了农村社区环境中的MRSA.

研究的目的:

  • 为了记录社区获得的MRSA感染的发病率.
  • 为了比较社区获得的MRSA风险因素与对甲素敏感的黄金色素 (MSSA) 的风险因素.
  • 分析MRSA菌株的遗传相关性.

主要方法:

  • 使用医疗记录审查的回顾性队列研究.
  • 在一个美国中西部农村印第安人社区的印第安人卫生服务机构进行的研究.
  • 分析包括MRSA分类,风险因素比较和脉冲场凝电泳 (PFGE) 以确定菌株类型.

主要成果:

  • 在112个金黄色葡萄球菌分离物中,62%是MRSA,45%是MSSA.
  • 很大一部分 (74%) 的MRSA感染是社区获得的.
  • 在社区获得的MRSA和MSSA之间没有发现风险因素的显著差异.
  • PFGE显示,大多数社区获得的MRSA菌株与临床病房菌株有克隆关系,并且与它们不同.

结论:

  • 社区获得的MRSA似乎是这个农村社区的主导菌株,可能取代MSSA.
  • 研究结果表明,MRSA在美国农村社区广泛传播,超出医院范围.
  • 抗微生物敏感性和菌株类型支持MRSA在非诺索科米亚环境中的广泛存在.