Abstract

This study was conducted to investigate the inhibitory role of alcoholic extract of Rosemarinus on some bacterial species: Listeria monocytogenes, Brucella aborus, Brucella melitensis, Escherichia coli, Pseudomonas aeruginosa, Bacillus anthracis (Sterne strain), Salmonella typhimurium, Klebsiella pneumoniae and Staphylococcus aureus. These strains were cultured on Mueller Henton agar then filter paper was saturated with alcoholic extract of Rosemarinus at concentration 200 mg/ml were added, the inhibitory zone were measured. The results revealed that the inhibitory effect of alcoholic extract was more effective on L. monocytogenes then Br. melitensis, S. aureus, S. typhimurium, B. anthracis (Sterne strain), Br. abortus, E.coli, P. aeruginosa, and K. pneumoniae respectively. Also susceptibility test of these strains for some antibiotics, which were Ampicillin (AM10mg), Vancomycin (VA30mg), Cephalothin (KF30mg), Ceftazidime (CAZ30mg), Tobramycin (TOB5mg), Ofloxacin (OFX5mg), Cloxacillin (CX1mg), and Cefaclor (CEC30mg) were compared with the susceptibility of these isolates for alcoholic extract of Rosemarinus. The results revealed that ofloxacin was more effective against all bacteria used in the current study, while cloxacillin had less effect on these bacteria.