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A, Percentage survivorship of eight American crows exposed to 1,500 plaque-forming units (PFU) of representative West Nile viruses (WNVs). American crows were checked twice a day for signs of disease. B, Mean (±SD) viremia response of eight American crows exposed to 1,500 PFU of representative WNVs. Viremias were determined by plaque assay on Vero cells with a detection limit of 1.7 log10 PFU/mL of serum. Only positive error bars and offset data points are presented for clarity.
