Merck Manual

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Newcastle disease, chickens
Newcastle disease, chickens

    Lethargy in young chicken (A); necrotic/hemorrhagic areas of comb in young chicken (B); lethargy with periorbital edema in adult hen (C); and head swelling in adult hen (D).

Courtesy of Southeast Poultry Research Laboratory of the USDA Agricultural Research Service. Images by Kiril Dimitrov.