 The study found that five commercial essential oils, oregano, eucalyptus, rosemary, clove, and peppermint produced by different companies had varying levels of antimicrobial activity against Staphylococcus aureus and Escherichia coli. The essential oils also demonstrated varying degrees of antibiofilm activity against pseudomonas aeroginosa. The study concluded that the variations in the essential oils chemical compositions and production methods may explain why some samples had higher antimicrobial or antibiofilm activity than others.