FCGR2A and infection: Enhancement of infection of FcγR-negative cells (Vero, BHK-21) was also described in experiments with the domain II-specific mouse mab E100, directed against the E protein of West Nile virus (WNV) [47], and the domain II-specific mouse mabs 1A5D-1 as well as 10A1D-2, directed against the E protein of dengue virus serotype 2 [48].