A Raphanus sativus niger water extract was administered by intranasal instillations to mice before inoculation of the influenza virus A/PR 8/34 (H1N1) strain by the same route. The extract ensured some protection against the experimental influenza infection. A significant decrease of the hemagglutinin titre of the mouse lung homogenate was noted, as well as a decrease of the mortality rate and a significant increase of the rate of survival as compared to the untreated controls.
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