what are coagulase negative staph - HEALTHIES
Comprehensive guide on treating infections caused by coagulase-negative staphylococci, covering diagnosis, management strategies, and clinical implications. UpToDate provides information on the epidemiology, microbiology, and pathogenesis of infections caused by coagulase-negative staphylococci. INTRODUCTION Coagulase-negative staphylococci (CoNS) are a major constituent of human skin and mucosal commensal flora [1-3].
Understanding the Context
Once considered relatively avirulent and a likely contaminant when isolated from a clinical specimen, these organisms have increasingly been recognized as a cause of clinically significant nosocomial bloodstream infections. Staphylococcus lugdunensis is a coagulase-negative staphylococcus, ranging from harmless skin commensal to life-threatening pathogen in humans. Medline ® Abstracts for References 2-5 of 'Infection due to coagulase-negative staphylococci: Treatment' 2 PubMed TI Overview of Changes to the Clinical and Laboratory Standards Institute Performance Standards for Antimicrobial Susceptibility Testing, M100, 31st Edition. AU Humphries R, Bobenchik AM, Hindler JA, Schuetz AN SO Coagulase is a protein enzyme produced by several microorganisms that enables the conversion of fibrinogen to fibrin.
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In the laboratory, it is used to distinguish between different types of Staphylococcus isolates. Coagulase is an enzyme-like protein and causes plasma to clot by converting fibrinogen to fibrin. Staphylococcus aureus produces two forms of coagulase: bound and free. Bound coagulase (clumping factor) is bound to the bacterial cell wall and reacts directly with fibrinogen. Tube coagulase test detects free coagulase (staphylocoagulase) which reacts with coagulase-reacting factor (CRF).
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CRF is a plasma protein, often described as a thrombin-like molecule, that serves as an activator. Coagulase is an extracellular protein that converts fibrinogen (a soluble plasma protein) into fibrin (an insoluble protein), leading to the formation of a clot. The clot formation provides a means of differentiating S. aureus from other staphylococci that do not produce coagulase. While S. aureus is the most commonly isolated coagulase-positive organism, there are several other species of Staphylococcus which are positive for coagulase activity.