<p>The aqueous and ethanol extracts of the bark of<em> Khaya senegalensis</em> were screened for their phytochemical constituents and preliminary antibacterial activity against <em>Bacillus subtilis, Escherichia coli</em> and<em> Proteus mirabilis. </em>The minimum inhibitory concentration (MIC) of the plant on the tested organisms was determined using multiple tubes method.</p><p>Alkaloids, anthraquinones, glycosides, tannins and steroids were detected in both extracts.</p><p>The ethanol and aqueous extracts of the plant showed antibacterial activity against <em>B. subtilis and E. coli,</em> with the aqueous extracts having more activity than those of ethanol. However the growth of<em> P. mirabilis</em> was not inhibited by either of the extracts. The MIC value was determined to be 50 mg/ml for<em> B. subtilis </em>and<em> E. coli. </em>The results are suggestive of considerable antibacterial activity of<em> K. senegalensis </em>and may justify its use in the treatment of bacterial diseases by herbalists or traditional healers.</p>
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