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The intravenous pathogenicity index (IVPI) scores in (A) chickens and (B) Pekin ducks. Ten 6-weeks old birds were infected with the HPAI H5N8-2020 virus isolated from the index farm, and were monitored for clinical signs and death for 10 days. The number of normal (green), sick (orange), very sick (red), and dead (dark gray) birds is shown for 10 days after infection.
