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Experimental infections of (A) Orange-crowned Warblers, (B) Yellow Warblers, and (C) Common Yellowthroats with the NY99 strain of West Nile virus (WNV). Shown are daily viremia estimates in days post infection in log10 plaque forming units per mL for each bird dying (filled points) or surviving (open points). Assay sensitivity 2.0 log10 plaque forming units (PFU)/mL.
