Coagulase-Staph

Coagulase-Staph - which results in clumping when a...

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Learning Issue: Coagulase-Staph Definition: Staphylococci are members of the family Staphylococcaceae and are nonmotile, non–spore- forming bacteria that are catalase-negative. Species of staphylococci are separated into two large groups on the basis of ability to produce the extracellular enzyme coagulase. Organisms that produce coagulase are known as coagulase-positive staphylococci, or S. aureus , and organisms that produce no coagulase are referred to as CoNS. The presence of coagulase can be evaluated either by assessing broth medium for secreted enzyme, which reacts with coagulase-reacting factor in plasma and results in formation of a fibrin clot, or by testing for cell-bound enzyme,
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Unformatted text preview: which results in clumping when a suspension of organisms is incubated with plasma. Coagulase-negative staphylococci (CoNs) CoNS are a heterogeneous group of organisms that have been divided into 32 species. The following 15 species of CoNS are found as members of the normal human flora: S. epidermidis, Staphylococcus haemolyticus, Staphylococcus saprophyticus, Staphylococcus capitis, Staphylococcus warneri, Staphylococcus hominis, Staphylococcus xylosus, Staphylococcus cohnii, Staphylococcus simulans, Staphylococcus auricularis, Staphylococcus saccharolyticus, Staphylococcus caprae, Staphylococcus pasteuri, Staphylococcus lugdunensis , and Staphylococcus schleifer...
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