Virus loads in organs collected from birds in experiment 2, on days 4, 6 and 10 pi. Virus colonization of organs was assessed and quantified by means of qRRT-PCR and TCID50, in MDCK cells. Colored and black columns represent the number of virus RNA copies and TCID50/0.1 g of tissue, respectively. Limits of detections for each scale are indicated by lateral bars. Values are shown on an individual basis, as indicated by the bird ID number on the X axis. LOD: limit of detection, inf: infundibulum, ma: magnum, is: isthmus, ut: uterus.