Studies on some aspects of antiviral activity. 1-influence of propolis on Newcastle disease virus
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The effect of popolis on different-Newcastle disease virus (NDV) vaccinal strains as well as virulent virus were studied. It was clear that the addition of propolis to NDV induced a significant reduction of infectivity mean titres. The effect of propolis was pronounced in Lasota, Colon-30 vaccines and virulent virus. The haemagglutination titers of Komarov (K) and virulent virus were reduced significantly. These data obtained offer a certain amount of new information on anti-Newcastle disease virus activity of propolis and point to be the significance of such natural product for practice as a possible anti Newcastle disease drug.