Figure 1.

Results of serological examination of serum series from A1 and B1 groups: (a) two horses experimentally infected with either Israel ′98 L1 WNV strain (dashed lines) or Austria′08 L2 WNV strain (continuous lines) and (b) five horses experimentally inoculated with Duvaxyn inactivated vaccine, as described in Materials and Methods section. Different curves correspond to optical density results (ordinate scale) obtained by IgM-capture ELISA (triangles), indirect IgG-VLP ELISA (circles), and indirect IgG-NS1 ELISA (crossed dots). In (b) each dot represents mean (bars: standard deviation) of five determinations, one for each horse.