Expression of Factor X in BHK-21 Cells Promotes Low Pathogenic Influenza Viruses Replication

Figure 2

Replication of influenza virus in BHK-21/FX cells. The titer of virus in BHK-21/FX cell supernatants was assayed by TCID₅₀ in ten subsequent passages compared to the virus infected MDCK and BHK-21 cells supplemented with trypsin.