Potential of rosemary oil to be used in drug-resistant infections.

<bold>Objective: </bold>To evaluate the antimicrobial activity potential of the essential oil of rosemary specifically for its efficacy against the drug-resistant mutants of Mycobacterium smegmatis, Escherichia coli, and Candida albicans.<bold>Method: </bold>Antibacterial, antifungal, and drug resistance-modifying activity was evaluated both qualitatively and quantitatively following disc diffusion and broth dilution assay procedures.<bold>Results: </bold>The rosemary essential oil was found to be more active against the gram-positive pathogenic bacteria except E. faecalis and drug-resistant mutants of E. coli, compared to gram-negative bacteria. Similarly, it was found to be more active toward nonfilamentous, filamentous, dermatophytic pathogenic fungi and drug-resistant mutants of Candida albicans.<bold>Conclusion: </bold>Our findings suggest that characterization and isolation of the active compound(s) from the rosemary oil may be useful in counteracting gram-positive bacterial, fungal, and drug-resistant infections. [ABSTRACT FROM AUTHOR]