The dichloromethane extract of OI root also exhibited significant effect against Listeria innocua (320<MIC<640; 640<MBC<1280), Staphylococcus aureus (320<MIC<640; 640<MBC<1280) Pseudomonas aeruginosa (640<MIC≤1280 μg / mL; 1280<MBC≤2560 μg / mL) and Bacillus cereus (640<MIC≤1280 μg / mL; 1280<MBC≤2560 μg/mL).