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Pathological lesions observed in SPF chicken inoculated with the IBDV HN strain. A. Kidney tissue from a bird that died at 4 dpi. B and C. Bursal tissues from SPF chickens inoculated with the HN strain of IBDV (right) or control (left). D. Proventriculus from SPF chickens inoculated with the HN strain of IBDV (right) or control (left). E. Bleeding in leg muscles from a bird that died at 4 dpi.
