Blood culture is positive in which infection of staph. aureus-
Blood culture is positive when bacteria present in blood, i.e. when there is bacteremia.
Infective endocarditis is a complication of staphylococcal aureus bacteremia (SAB). Thus blood culture may be positive.
Staphylococcal scalded skin syndrome (SSSS) and impetigo do not have bacteremia.
In toxic shock syndrome (TSS) due to staphylococcus aureus, bacteremia is uncommon (in contrast, bacteremia is common in streptococcal TSS).
TSS
SSSS
Infective endocarditis
Impetigo