Azadirachta indica (NEEM): antibacterial effects against Escherichia coli and Salmonella

  • Poonam Panchal
  • Himani Bajaj
  • Shivangi Maheshwari


The main objective of the study is to evaluate antibacterial activity of Neem leaf extracts (
methanolic) against E. coli and salmonella using Zone of Inhibition (ZOI) method.
Azadirachta indica (neem) leaf extract was used to test antimicrobial activity against
disease causing bacteria E.coli and Salmonella Methanol extracts of varying
concentrations 0.5, 1.0, 1.5, and 2.0% was prepared and tested against test organisms
using agar diffusion method. Gentamicin of same varying concentrations was used to
compare the effect of antimicrobial activity of methanol leaf extract. Data revealed that
methanol extract of Neem has shown highest antimicrobial activity as compared to other