The anti-microbial activity of ethyl acetate, ethanol and methanol extract of leaf, flower, seed and root of the plant Acanthus ilicifolius collected from Kakinada mangrove forest was studied. The crude plant extracts of ethyl acetate, ethanol and methanol were tested against pathogenic bacteria such as Aeromonas hydrophila, Vibrio harveyi and Escherichia coli. The ethyl acetate, ethanol and methanol extracts of the different parts of the A. ilicifolius exhibited strong to moderate activity against test microorganisms. The inhibition zone exhibited by ethyl acetate extract was significantly higher than that produced by ethanol and methanol extracts.
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