Staph epidermidis thrive as Gram-positive cocci in clusters. 

-They are Coagulase-negative. Catalase-positive.

-Coagulase negative Staph are the most common cause of nosocomial bloodstream infections 

-They reside on the human skin and can enter the bloodstream at the site of intravenous catheters 

-They cause pyogenic infections on prosthetic implants such as heart valves, pacemakers, and hip joints

St-Treatment: Vancomycin plus either rifampin or an aminoglycoside.