Does bactrim treat enterococcus UTI? Enterococci areintrinsicallyresistant to all Cephalosporins, Clindamycin, Bactrim. For polymicrobial infections, if Ampicillin-susceptible Enterococcus, Zosyn can also be used; if Ampicillin-susceptible E. faecalis, Meropenem can also be used. Does Enterococcus faecalis r...