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9 Cards in this Set

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Staphylococcus aureus

Most pathogenic of the staphylococci



Can infect the skin & many other tissues



Can produce a wide range of harmful enzymes & toxins (among these enzymes & toxins that can kill WBCs, trigger a fibrin clot, or cause shock)



MRSA

Methicillin-resistant Staphylococcus aureus



Antibiotic-resistant strains of staphylococci

Mannitol salt agar

Medium that is both selective & differential

Mannitol Salt agar

Contains high concentration of salt (7.5% NaCl)

Mannitol Salt agar

Inhibits the growth of most bacteria except staphylococci (halophilic) & micrococci

Mannitol Salt agar

This medium contains the sugar mannitol & pH indicator phenol red

Staphylococcus aureus

Pathogenic



Grows on mannitol salt agar


Garments mannitol


Produces acid


Changes the color of the pH indicator

Staphylococcus epidermis

Nonpathogenic



Grows


Does not ferment mannitol


Does not produce acid

Lack of growth

Due to inhibition by the high level of salt in medium