NECTIN2 and viral infectious disease: Indeed, recombinant nectin-2-Fc was found to be weakly bound to gB-HA in a nectin-2 direct binding assay (Figure 6B), and the efficiency of viral infection was low, even in the ex6 C7 cells, in which the mean fluorescence intensity was approximately three times higher than that in the HSB2-cont cells (Figure 3C,E).