The aim of the study was an in vitro assessment of the antimicrobial efficacy of water, methanol and ethanol extracts of Korean ginseng tea, which is widely used in Asian folk medicine. Nine test microorganisms were used: Escherchia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Staphylococcus epidermidis, Klebsiella pneumonia, Proteus mirabilis, Bacillus subtilis, Bacillus cereus, and Salmonella enteritidis. The minimum inhibitory concentration (MIC) of active extracts was determined by using a macro-broth-dilution assay. Methanol and ethanol extracts from the tea were active against some bacterial strains while only the water extract was active against all bacterial strains. The MIC values for active extracts ranged between 7.5 and 500 mg/ml. The results of the study indicate that ginseng may be safely used in the treatment of some infectious diseases.
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