infections causing failure in patients in the cefoxitin group more frequently contained cefoxitin resistant gram-negative rods at the time of failure than did infections causing failure in those in the clindamycin-aminoglycoside group that contained gentamicin-resistant gram-negative rods , eight of eight versus zero of eight , p less than 0.001 .
C0002556
aminoglycoside
C0017436
gentamicin