10.22376/ijpbs.2019.10.1.p1-12 Volume 4 Issue 2 2013 (April - June) The point of the present study was focused on investigating the antibacterial property of the acetone and aqueous extract of the leaves and stem of lessThan i greaterThan Andrographis elongata lessThan /i greaterThan T. And. (Acanthaceae) using agar well diffusion manner against human pathogenic bacterial species, namely lessThan i greaterThan Bacillus cereus, Escherichia coli, Klebsiella pneumoniae lessThan /i greaterThan and lessThan i greaterThan Staphylococcus aureus lessThan /i greaterThan . In the present investigation all the extracts were found to be efficient against four human bacterial species, lessThan i greaterThan B. cereus lessThan /i greaterThan , lessThan i greaterThan E. coli, lessThan /i greaterThan lessThan i greaterThan K. pneumoniae lessThan /i greaterThan and lessThan i greaterThan S. aureus lessThan /i greaterThan susceptible to all the plant extracts. Among various extracts studied, the aqueous stem extract showed highest antibacterial potential against lessThan i greaterThan S. aureus lessThan /i greaterThan (16.41 mm) followed by acetone extract (14.40 mm). The maximum control extent noted for aqueous extract of lessThan i greaterThan A.elongata lessThan /i greaterThan leaves against lessThan i greaterThan B.cereus lessThan /i greaterThan was 12.06 mm followed by acetone extract (10.37mm). The study suggests that the extract of part of the plant restrain modern extensive wide range of antibacterial screening. The antibacterial potentialities of aqueous extracts was prove to be maximum than that of acetone extracts. However the stem extract showed more inhibitory determine than the leaf extracts. This research suggests that original products acquired from lessThan i greaterThan A. elongata lessThan /i greaterThan may contribute to the expansion of recent antimicrobial agents lessThan i greaterThan . lessThan /i greaterThan It is the first report on the antibacterial potential of lessThan i greaterThan A. elongata lessThan /i greaterThan . ALAGESABOOPATHI C Andrographis elongata, Antibacterial activity, Plant extracts, Agar well diffusion method. 503-510