Antibacterial Activity of Water and Alcoholic Crude Extract of Flower Achillea millefolium

The aim of this study was to determine the antimicrobial effect of yarrow and it is flower extract on certain microorganisms. The ethanolic (alcoholic) extract of the flower and aqueous (water) extract was tested against: Pseudomonasa aeruginosa, Salmonella enterica enterica (Typhimurium), Shigella flexneri, Micrococcus luteus, Staphylococcus aureus and Enterococcus faecalis. Using the diffusion test, the alcoholic and aqueous flower extract at 200 mg /ml possessed abroad spectrum of antimicrobial activity against all tested microorganisms at different conc., alcoholic extract had the greatest inhibitory effect (diameter of inhibition zone) against Pseudo. aeruginosa 30 mm, Staph. aureus 24 mm and Micro. lutues 23 mm, While the aqueous extract slightly inhibited Pseudomonasa aeruginosa and Micrococcus luteus 12mm and 10 mm respectively compared with standard antibiotic Ciprofloxacin 26 mm, 22mm and 22mm but Entero. faecalis, S. enterica enterica (Typhimurium) and Shig. flexneri show high resistance for both extract 8 mm, 0 mm, 9 mm, 12 mm and 8 mm, 10 mm but sensitivity for Ciprofloxacin 23 mm, 30 mm and 31 mm. Minimum inhibitory concentration (MIC) were determined for alcoholic extract against sensitivite microorganisms: Pseudo. aeruginosa 50 mg/ml, Staph. aureus 100 mg/ ml and Micro. luteus 100mg/ ml. It could be concluded that the alcoholic extract of yarrow flower have considerable antimicrobial effect on some pathogenic which cause infection.