Catechin Gargling for Influenza Infection

A Randomized Clinical Study of Catechin Gargling Effects on the Prevention of Influenza Infection

The purpose of this study is to clarify the preventive effects of catechin gargling on the influenza infection.

In-vitro experimental studies have revealed that tea catechin extracts induce preventive effects on influenza infection. However, few studies have been conducted on the effects of tea gargling on influenza infection, and the clinical evidence is unclear. Also there have been no studies reported on the gargling effects with tea catechin extracts on the prevention of influenza infection.

Inclusion Criteria:

• healthy volunteers
• aged 20 to 65 years old
• obtained written informed concent before participation
• inoculated with influenza vaccine before entering the study

Exclusion Criteria:

• other gargling except water during the study
• possessing tea allergy