[Antibacterial and bactericidal activities of Japanese green tea]

Nihon Saikingaku Zasshi. 1989 Jul;44(4):669-72. doi: 10.3412/jsb.44.669.
[Article in Japanese]


We found that extracts of Japanese green tea leaves inhibited the growth of various bacteria causing diarrheal diseases. All tea samples tested showed antibacterial activity against Staphylococcus aureus, S. epidermidis, Vibrio cholerae O1, V. cholerae non O1. V. parahaemolyticus, V. mimicus, Campylobacter jejuni and Plesiomonas shigelloides. None of the tea samples had any effect on the growth of V. fluvialis, Aeromonas sobria, A. hydrophila, Pseudomonas aeruginosa, Salmonella enteritidis, enteroinvasive Escherichia coli, enterohemorrhagic E. coli, enteropathogenic E. coli, enterotoxigenic E. coli, Enterobacter cloacae or Yersinia enterocolitica. Salmonella and Shigella showed susceptibilities different depending on the kind of Japanese green tea. Japanese green tea showed also bactericidal activity over S. aureus, V. parahaemolyticus and even enteropathogenic E. coli which was not sensitive when tested by cup method. The bactericidal activity was shown even at the drinking concentration in daily life.

MeSH terms

  • Bacteria / drug effects*
  • Bacteria / growth & development
  • Drug Resistance, Microbial
  • Escherichia coli / drug effects
  • Plant Extracts / pharmacology*
  • Staphylococcus aureus / drug effects
  • Tea* / analysis
  • Vibrio parahaemolyticus / drug effects


  • Plant Extracts
  • Tea