The susceptibilities of 138 clinical isolates of Arcanobacterium haemo
lyticum to 11 antimicrobial agents were tested. All strains were susce
ptible to phenoxymethylpenicillin, cephalosporins, erythromycin, azith
romycin, clindamycin, vancomycin, doxycycline, and ciprofloxacin but w
ere resistant to trimethoprim-sulfamethoxazole.