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    Kansenshogaku Zasshi. 1997 Jun;71(6):487-94.

    [Prophylactic effect of black tea extract as gargle against influenza].

    [Article in Japanese]
    Iwata M, Toda M, Nakayama M, Tsujiyama H, Endo W, Takahashi O, Hara Y, Shimamura T.

    Source

    Department of Microbiology and Immunology, Showa University School of Medicine.

    Abstract

    We examined whether gargling with black tea prevents influenza infection. Tests were carried out during a five month period (October 1992 to March 1993). The control group that followed their normal daily routine, whereas the test group that gargled with 0.5 w/v% black tea extract twice daily (at 8 a.m. and 5 p.m.). Influenza viruses were isolated from influenza patients and an antigen analysis was carried out. As a result, two strains of influenza A viruses (H3N2) and ten strains of B virus were detected. An HI test was done using paired sera of the control group and the test group. The HI titers raised a four fold or greater in 48.8% (61/125) in the control group and 35.1% (35/134) in the test group. There was a significant difference (p < 0.05) between the control and test groups. These results indicate that black tea extract is effective as a prophylactic agent against influenza infection.

    PMID:
    9248263
    [PubMed - indexed for MEDLINE]

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