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Tissue tropism (pathogenesis) comparison following H5N8-2020 and H5N1-2020 infections in chickens. Viral RNA detection is shown for 18 tissues from chickens directly infected with high-dose (a) H5N8-2020 and (b) H5N1-2020. Tissue samples were collected at 1 dpi (black symbols), 2 dpi (green symbols), and 3 dpi (red symbols, but included chicken #3, which required euthanasia at 2.5 dpi following H5N1-2020 infection).
