- OXA oxacillin, FOX cefoxitin, PEN penicillin, ERY erythromycin, CLI clindamycin, TET tetracycline, CMP chloramphenicol, RFA rifampicin, GEN gentamicin, STR streptomycin, KAN kanamycin, SXT trimethoprim-sulfamethoxazole, NIT nitrofurantoin, LNZ linezolid and CIP ciprofloxacin, S susceptible, R resistant.