Gram+CocciCat+Ox-

Catalase Positive Oxidase Negative Gram Positive Cocci
The only genus matching these criterion is the Staphylococci. The full list includes aureus, epidermidis, haemolyticus, and saprophyticus.

Tests
essential: coagulase/DNase/PR Manitol, PR Xylose, MR-VP

helpful: MSA agar, Blood agar

Key
1-A: The organism is MR positive and VP Positive GO TO 2

1-B: The organism is MR positive and VP Negative GO TO 3

2-A: The organism is Beta hemolytic, coagulase positive, PR manitol positive, DNase positive S. aureus

2-B: The organism is Gamma hemolytic, coagulase negative, PR manitol negative, DNase negative S. epidermidis

3-A: The organism is PR Xylose positive S. haemolyticus

3-B: The organism is PR Xylose negative S. saprophyticus