Antiviral Activity of Citrus Limon, Matricariarecutita L., Allium ascalonicum L., and Rosa damascene against Newcastle Disease Virus

This study was done to investigate antiviral activity of four plants. For this purpose، the extracts of four plants were ready and adjacent to virus. EID50 of virus and virus/extract was calculated for any plant by Reed and Muench method. Antiviral activities were calculated as the difference of virus titer between treated and untreated infected control eggs and expressed by inhibition percentage (IP). The results of this test showed Limon had the most antiviral activity and could reduce viral pathogenicity of NDV as 100 fold. Matricariarecutita L.، Allium ascalonicum L. could reduce activity of virus as 3. 8 and 40. 5 fold respectively، but Rosa damascene did not have any significant effect on virus. Accordingly، three out of four of these extracts were found effective.