Antimicrobial and Bactericidal activities effect of green tea extracts was investigated. Minimal Inhibitory Concentration(MIC) of green tea extracts against 14 well known strains of diarrheal disease bacteria was determined at 35 C. Antibacterial activity was observed in green tea extracts against diarrheal disease bacteria such as Shigella dysenteriae TV 11, Plesionomnas shigelloides N 60 and Bacillus cereus JCM 2152. The MIC of EGC, ECg, EGCg in polyphenolic compounds against Shig. dysenteriae TV 11 were 67㎍/0.1㎖, 15㎍/0.1㎖, 34㎍/0.1㎖, respectively. The MIC of the polyphenolic compounds analogue against diarrheal disease bacteria such as Shig. dysenteriae TV 11, Plesionomonas shigelloides N 60 and Bacillus cereus JCM 2152 were strongly Pyrogallol>Tannic acid>Gallic acid, respectively. Green tea extracts had strong growth inhibition activity against several diarrheal disease bacteria.
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