This study evaluated the antibacterial activity of Glycyrrhiza glabra roots extract was evaluated against several food-borne bacterial pathogens. Results show that the aqueous extract was more effective than the others; while, among the tested bacteria, Staphylococcus aureus and Pseudomonas aeruginosa were the most sensitive and the most resistant, respectively.

The antibacterial activity of extracts of four medicinal plants (Ferula gummosa, Echinophora orientalis, Nasturtium microphyllum and Verbascum Thapsus) was evaluated. All four plants had satisfactory antibacterial effects against both Gram-positive and Gram-negative bacteria, with no significant haemolytic activity on human red blood cells.