Figure 5
Viremia of protected and unprotected mice following WNV challenge. Sera taken from the blood of three mice from each group 2 days after infection were titrated on Vero cells to determine levels of virenia. Each point represents the titer from one mouse; black and red dots denote animals that survived and died, respectively. The dashed line represents the limit of detection (LOD) for this assay, which was 4 × 102 FFU/ml of serum. Mice with a viremia less than the LOD were arbitrarily shown as dots at the bottom of the graph.