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Viremia response (mean ± SD) of six house sparrows inoculated with 1,500 plaque-forming units (PFU) of each respective West Nile virus strain (dashed lines indicate for strains from Mexico). Only positive error bars and offset data points are presented for clarity. Viremias were determined by plaque assay on Vero cells with a detection limit of 1.7 log10 PFU/mL of serum.
