Avian Flu symptoms in unvaccinated broiler chickens, virus H5N1 infection. Clinical signs & Gross pathological lesions pictures for learning materials, for veterinary students, poultry breeders.
This video about infectious bronchitis in broiler chicken at the young age (10 days old), and follow with Avian influenza at 24 days old.
HPAI viruses cause severe, systemic disease with high mortality in chickens, mortality can be as high as 100% in a few days. In peracute cases, clinical signs or gross lesions may be lacking before death. However, in acute cases, lesions may include cyanosis and edema of the comb, head, and wattle; edema and red discoloration of the shanks and feet due to subcutaneous ecchymotic hemorrhages; petechial hemorrhages on visceral organs and in muscles; and blood-tinged oral and nasal discharges.
In severely affected birds, greenish diarrhea is common occur. But, birds that survive the peracute infection may develop CNS, opisthotonos, torticollis, incoordination, paralysis, and drooping wings. The location and severity of microscopic lesions are highly variable and may consist of edema, hemorrhage, and necrosis of parenchymal cells of multiple visceral organs, skin, and CNS.