<prompt> Blood culture is positive in which infection of Staphylococcus aureus isTSSSSSInfective endocarditisImpetigo  <response>: Infections caused by methicillin-sensitive S aureus, high-magnitude bacteremia defined as 4 positive blood cultures , and endocarditis. The most impoant test is a blood culture used to identify bacteria in the bloodstream. REFERENCE: 