[Comparative study of interferon inducers obtained from natural sources].

Interferon-inducing and antiviral effects of natural dsRNA preparations of phage phi 6 and yeast cells were studied in the culture of murine cells L-929 and on random bred albino mice. Both the preparations showed interferon inducing activity in the cell culture. However, for realization of their effect modification of the surface cell membrane by polycation exchange resin (DEAE-dextran) was required. The interferon-inducing activity of both of the natural dsRNA in the mice was high. The maximum interferon titers (1280-5120 units/ml) in blood serum were observed 4-6 hours after the inductor intraperitoneal administration. The interferon-inducing activity of the phage dsRNA was high in the cell culture and yeast dsRNA--in mice, respectively. Both the inductors had antiviral activity and protected 15 to 38.9 per cent of the experimental animals from the effect of 100 LD50 of the murine encephalomyocarditis virus and 10 LD50 of the influenza virus A/Aichi 2/68 (H3N2).