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Detection of pre-infection antiviral activities of rPoIFN-β. Three cell lines (A–C) were treated with the indicated concentrations of rPoIFN-β for 24 h and then infected with the three pig viruses. The pre-infection antiviral activities were measured in triplicates by CPE inhibition assay. ** indicates significant difference (p < 0.01) in CPE protection of rPoIFN-β as compared with the virus control (VC).
