[en] A laboratory-prepared neem (Azadirachta indica A. Juss.) callus extract along with neem leaf extracts were investigated for their antimicrobial activity. Various extract concentrations (5, 10, 20 mg/ml) were determined for their rate and extent of inhibition kinetics against staphylococcus aureus, Escherichia coli, and Candida albicans. Bacterial suspensions were serially diluted and, inoculated with appropriate concentration, incubated for time intervals for up to 24 h and plated on the corresponding medium. Results obtained showed that callus extracts of A. indica wiped out all viable cells of C. albicans within 18 h at concentration of 20 mg/ml , while S. aureus showed very high response to the extracts at all concentrations to reach complete elimination within 4 h. The E coli cells were not completely eliminated by extracts even after 24 h. Similar kinetics was shown by leaf extracts but in slight rate as compared to the callus extract. In general both extracts possessed antimicrobial activity with notable efficient rates. (Author)