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Bars without error represent samples that were analyzed but where no viral culture was found, below limit of detection (LOD). Nasal wash (NW) samples were obtained on day 2, 4, and at necropsy (Nx). Tissue samples obtained at necropsy were lung lavage (lavage), four sections of lung (lung), tracheal rings (trachea), turbinates (turbs.), and brain (cer. cort.).
