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2994 Unknown

A 57-year-old man arrives at the emergency room complaining of weakness, fatigue, and intermittent fever that has recurred for several weeks. The patient had a cardiac valvular prosthesis implanted 5 years ago. Blood cultures grew ceain gram-positive cocci on which catalase and coagulase test were done. The gram-positive organisms failed to ferment mannitol, and their growth was inhibited by novobiocin. CATALASE TEST SLIDE COAGULASE TEST Lesions seen on skin What is the most likely infectious agent?

AStaphylococcus aureus
BStaphylococcus epidermidis
CStaphylococcus saprophyticus
DStreptococcus viridans
Unknown
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