10.22376/ijpbs.2019.10.1.p1-12 Volume 4 Issue 3 2013 (July - September) Antibacterial activities of two green seaweeds, namely lessThan i greaterThan Chaetomorpha media lessThan /i greaterThan (C. Agardh) Kutz. and lessThan i greaterThan Enteromorpha intestinalis lessThan /i greaterThan (L.) Nees were screened against five common human bacterial pathogens ( lessThan i greaterThan Escherichia coli, Proteus vulgaris, Bacillus subtilis, Salmonella typhi and Staphylococcus aureus). lessThan /i greaterThan Extracts of dry algal material, prepared in Methanol, Ethanol, Petroleum ether, Ethyl acetate and Hexane were tested for the antibacterial activity. Ethanol extract of both the algae was found effective against all the bacterial strains used. Maximum inhibition was reported for the ethanol extracted lessThan i greaterThan E. intestinalis lessThan /i greaterThan (87.50%) and methanol extracted lessThan i greaterThan C. media lessThan /i greaterThan (84.70%) against bacterium lessThan i greaterThan Proteus vulgaris lessThan /i greaterThan . lessThan i greaterThan E. coli lessThan /i greaterThan was found to be the most insensitive pathogen in the present study and exhibited 40–50% inhibition in different solvents. MEGHA N. MOLE AND ANJALI B. SABALE Antibacterial activity, antibacterial index, green seaweeds, Chaetomorpha , Enteromorpha 716-720