Dr. Okada(#17) has noted the fact that tobacco growers use an exudat of green tea to prevent crop damage by the tobacco mosaic virus an verified that green tea catechin suppresses the growth of this virus. I addition, Prof. Shimamura(#18) has determined that green tea catechin and theaflavin (an oxidized form of catechin) present in black tea have a stron effect on the influenza virus. Green tea catechin and black tea theaflavi directly act on the influenza virus and inactivate it. It appears, therefore, that gargling with green or black tea is very effective in preventing influenza. This effect is increased by keeping the green tea catechin and the virus in contact as long as possible.
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[Source: green tea extract - Articles]
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