“…Data from most published clinical trials indicate that SSIs are primarily associated with gram-positive bacteria, S. aureus, and coagulase-negative staphylococci. 6,8,[537][538][539][540][541][542][543][544][545][547][548][549][550][551][552][553][554] Several cohort studies revealed high rates (up to 75-80% of isolates) of MRSA 540-543,548-552 and coagulasenegative staphylococci among patients undergoing a variety of neurosurgical procedures. 539,540,543,549 Other skin organisms such as P. acnes may be seen after CSF shunt placement, craniotomy, and other procedures.…”