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WNV-RNA titers (represented as genome equivalents per milliliter, upper panels) and infectious virus (represented as pfu/ml, lower panels) in oral (A) and cloacal (B) swabs of birds infected with WNV-Lineage 1 or WNV-Lineage 2 at different time post infection. Dashed line represents limit of detection of the qRT-PCR assay.
