The antiviral effect of Keishi-ni-eppi-ichi-to, a tranditional Chinese herbal medicine, on influenza A2(H2N2) virus infection in mice

M. A. Ball, T. Utsunomiya, K. Ikemoto, M. Kobayashi, R. B. Pollard, F. Suzuki

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The antiviral effect of Keishi-ni-eppi-ichi-to (TJS-064), a traditional Chinese herbal medicine, was investigation in mice infected with influenza A2(H2N2) virus. When mice exposed to 5 LD50 dose of the virus were treated orally with a 70 mg/kg dose of TJS-064 1 day before and 1 day and 4 days after the infection, 100% survived over a 25-day experimental period. At the end of this period all the control mice, treated with saline alone, had died; their mean survival time in days (MSD) was 11.2 days. When mice infected with a 10 LD50 dose of the virus were treated with TJS-064, the MSD was >17.4 days and there was a 50% survival rate, while the control group had a MSD of 8.7 days and 0% survival rate. No significant antiviral effect TJS-064 was observed when the agent was administered orally to mice infected with a 100 LD50 or large dose of influenza virus. Pulmonary consolidation, virus titers in lung tissues and HAI titers in sera of infected mice treated with TJS-064 were all significantly lower than those of infected mice treated with saline. Interferon activities were detected in sera of mice treated with the agent at a dose of 100 mg/kg orally. Since viricidal and viristatic activities of the agent against influenza virus were not demonstrated, the antiviral effects of TJS-064 may be expressed through the host's antiviral functions including interferon production.

Original languageEnglish (US)
Pages (from-to)774-779
Number of pages6
Issue number8
StatePublished - Aug 1 1994


  • Traditional Chinese herbal medicine
  • a mouse model
  • antiviral effect
  • influenza virus

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)


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