A 54-year-old man develops a pyogenic infection along the suture line after knee surgery. The laboratory gives a preliminary report of a beta-hemolytic, catalase-positive, coagulase-positive, Grampositive coccus. The most likely causative agent is

Question

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Of the answer choices, only streptococci and staphylococci are Gram-positive. The streptococci are catalase-negative and staphylococci are catalase-positive. Of the two staphylococci, Staphylococcus aureus is the beta-hemolytic, coagulase-positive organism.

A 54-Year-Old Man Develops a Pyogenic Infection Along the Suture