Figure 3. WNVE-specific IgG ELISA end point titers in mice immunized twice at 3 week intervals with 100 ng WNVE/animal/dose of AuNP-E. Antibody production was expressed as the reciprocal of the maximum dilution giving a greater absorbance than sera from PBS-immunized mice. Significant differences: *p < 0.05; ***p < 0.001 (means ± SEM, n = 10).