Several antimicrobial agents used in selective media for the isolation of Arcobacter were found to be inhibitory to strains belonging to this genus. All three species tested were susceptible to colistin and rifampin at concentrations used in selective media. Arcobacter skirrowii was the most susceptible species. 5-Fluorouracil, novobiocin, trimethoprim, and teicoplanin or vancomycin were found to be without any inhibitory effect on the strains tested at concentrations described for the isolation of Arcobacter species.