SBA plate showing S. aureus, S. saprophyticus, and S. epidermidis. Arrow points to prominent zone of beta hemolysis surrounding S. aureus isolate.
S. saprophyticus from urine culture on sheep's blood agar.
S. saprophyticus are resistant to novobiocin (gyrase inhibitor;
top hald of SBA plate),
a factor which distinguishes them from sensisitve S. epidermidis
(bottom half of SBA plate).