Antimicrobial activity of oregano oil against antibiotic-resistant Salmonella enterica on organic leafy greens at varying exposure times and storage temperatures

► Oregano oil was highly effective against Salmonella Newport on organic leafy greens. ► Antimicrobial activity increased with initial exposure time and storage time. ► Antimicrobial activity of oregano oil against S. Newport was concentration-dependant. ► Storage temperature had limited effect on the antimicrobial activity of oregano oil. ► Antimicrobial activity of oregano oil varied among the organic leafy greens.