Objective: To evaluate the antibacterial activity of Gracilaria verrucosa (G. verrucosa) (Hudson),Hypnea musciformis falk, Gracilaria ferugosoni (G. ferugosoni), Gelidium species and G. verrucosa var. against the selected bacterial pathogens. Methods: The antibacterial activities of methanol and aqueous hot extracts were tested against various organisms by using disc diffusion method. Results:The highest antibacterial activity (13 mm) was shown by the aqueous extract of G. verrucosa var. against Pseudomonas aeruginosa (P. aeruginosa) and the lowest activity (6 mm) was observed in the methanol extract of E. prolifera against Escherichia coli (E. coli). However in most of the seaweeds, methanol extract was found to be more effective. The microbial strains Salmonella typhi (S. typhi), Staphylococcus aureus (S. aureus), Bacillus subtilis (B. subtilis) and Candida albicans(C. albicans) were resistant to the aqueous extracts of all seaweeds. Conclusion: Further (H. musciformis) (Wulf) Lamour, Enatiocladia prolifera (E. prolifera) (Grev.) work is needed to identify the principle compound which is responsible for antibacterial activity against pathogenic bacteria especially those causing the human diseases.
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