Synergic effects of interferon and interferon inducer against ectromelia virus infection in mice.

Intraperitoneal injection of mouse brain interferon into mice 24 hr before inoculation of ectromelia virus, significantly reduced the mortality rate and prolonged the mean day of death (MDD). Intravenous injection of Newcastle disease virus (NDV) 24 hr before virus inoculation, also had significant beneficial effects. Furthermore, combined treatment with interferon and NDV had more protective effect against virus infection than either interferon or NDV treatment alone.