Table 3.

Bacteria cultured in the 22 SSIs^a

Bacteria	Cefazolin	Cefazolin and vancomycinb
No infection	493	1313
Infection
MRSAc	4	1
MSSA	3	6
CNS	0	4
Streptococcus varieties	0	2
Others	3d	6e

SSI = surgical site infection; MRSA = methicillin resistant Staphylococcus aureus; MSSA = methicillin-sensitive Staphylococcus aureus; CNS = coagulative negative Staphylococcus

^aThere were seven SSI in the cefazolin group. Multiple organisms grew in multiple sites.

^bThere were 15 SSI in the cefazolin and vancomycin group. Multiple organisms grew in multiple sites.

^cOdds ratio 95% CI, 29.0 (4.0, 593.3); numbers needed to treat 95% CI, 138.0 (101.5, 2828.2).

^dOne each of E coli, Klebsiella, B fragilis.

^eOne each of Diptheria, E aerogenes, Enterococcus, Pseudomonas, Acinectobacer, Proteus.