en باکتری شناسی bacteriology Research Article Research Article <span style="font-size:12px;"><span style="font-family:Times New Roman;"><b>Background:</b> Medicinal plants have played crucial roles in the traditional health care system since the origin of mankind. Among them, cinnamon is used not only as a spice in food but also as a substance with many health-beneficial effects. The aim of the present study was to identify the antibacterial activity of cinnamon bark extract against bacterial isolates from patient pus samples that might help treat infections.<br> <b>Methods:</b> The antibacterial potential of cinnamon bark extract in both ethanol and methanol against 6 bacterial isolates obtained from pus samples received in the Microbiology Laboratory was identified by agar well diffusion, minimum inhibitory concentration (MIC), and minimum bactericidal concentration (MBC) using standard techniques.<br> <b>Results:</b> By agar well diffusion, the highest inhibitory activity of ethanol and methanol extracts of cinnamon was shown by <i>Staphylococcus aureus,</i> followed by coagulase-negative<i> Staphylococci. </i>The lowest inhibitory effect was shown by <i>Proteus mirabilis</i>. The ethanol extract of cinnamon MIC and MBC ranged from 6.25 mg/mL to 12.5 mg/mL and 12.5 mg/mL to 50 mg/mL. The methanol extract of cinnamon MIC showed a value of 12.5 mg/mL, and the methanol extract of MBC ranged from 12.5 mg/mL to 50 mg/mL against all bacterial isolates of the present study.<br> <b>Conclusion</b>: <i>Staphylococcus aureus</i> is sensitive to the alcoholic extract of cinnamon bark, but its effect is less than that of the selected antibiotic.</span></span><br> &nbsp; Anti-bacterial agents,Cinnamon oil, bark,Plant exudates 1 3 http://mlj.goums.ac.ir/browse.php?a_code=A-10-1487-1&slc_lang=en&sid=1 Manasa Sireesha Devara devaramanasa18@gmail.com 100319475328460026654 0009-0009-6955-3184 Yes Gayatri Vidya Parishad Institute of Health Care and Medical Technology, Visakhapatnam, India Sriushaswini Bhamidipati usha_sri3@rediffmail.com 100319475328460026655 0009-0000-7633-2907 No Department of Surgery, Gayatri Vidya Parishad Institute of Health Care and Medical Technology, Gvpihcmt, Visakhapatnam, India Vijaya Bharathi Dondapati drkvb@rediffmail.com 100319475328460026656 100319475328460026656 No Department of Microbiology, Gayatri Vidya Parishad Institute of Health care and Medical Technology, Gvpihcmt, Visakhapatnam, India Narasinga Rao Bandaru narasinga_bandaru@rediffmail.com 100319475328460026657 100319475328460026657 No Gayatri Vidya Parishad Institute of Health Care and Medical Technology, Visakhapatnam, India