Moreover, Fig. 8c showed that after the viral infection, IFN-β mRNA expression was enhanced in all infection groups to varying degrees; IFN-β mRNA in the group infected with GTPV followed by PPRV had the highest up-regulation (80 times higher than the control group), while the group infected with GTPV alone the lowest expression. This evidence concerns the gene IFNB1 and viral infectious disease.