Figure 3: TEM images of immunogold tests for selectivity tests. Left column shows control groups from top to bottom (A) H1N1 (C) H3N2 (E) H5N1 VLPs before treatments (scale bar: 50 nm). Right column shows the virus samples reacting with gold nanoparticles conjugated with anti-avian influenza A H5N1 Hemagglutinin 1 (H5N1/HA1) antibody (scale bar: 100 nm). Only the (F) H5N1 VLPs obviously show the attachments of AuNPs to the VLP surface.