In highly pathogenic avian influenza , the disease appears suddenly in a flock and many birds die either without premonitory signs or with minimal signs of depression, inappetence, ruffled feathers and fever. Other birds show weakness and a staggering gait. Hens may at first lay soft-shelled eggs, but soon stop laying. Sick birds often sit or stand in a semi-comatose state with their heads touching the ground. Combs and wattles are cyanotic and oedematous, and may have petechial or ecchymotic haemorrhages at their tips. Profuse watery diarrhoea is frequently present and birds are excessively thirsty. Respiration may be laboured. Haemorrhages may occur on unfeathered areas of skin. The mortality rate varies from 50 to 100%.
In broilers, the signs of disease are frequently less obvious with severe depression, inappetence, and a marked increase in mortality being the first abnormalities observed. Oedema of the face and neck and neurological signs such as torticollis and ataxia may also be seen. The disease in turkeys is similar to that seen in layers, but it lasts 2 or 3 days longer and is occasionally accompanied by swollen sinuses. In domestic ducks and geese the signs of depression, inappetence, and diarrhea are similar to those in layers, though frequently with swollen sinuses. Younger birds may exhibit neurological signs.
Government scientists theorize that when ducks and other migratory waterfowl from different flyways gather at their northern breeding grounds this summer, they could expose each other to the highly pathogenic H5N2 virus, then carry it back south this fall along several migration routes, perhaps including the Atlantic Flyway. That flyway includes several of the country's top poultry producing states including Georgia, the Carolinas, Virginia, Delaware and Maryland.
Bird Flu Outbreak Could Head Eastward With Fall Migration
http://abcnews.go.com/Technology/wireStory/bird-flu-outbreak-head-eastward-fall-migration-30346589
5.3 million Iowa laying hens to be destroyed in bird flu outbreak
http://www.desmoinesregister.com/story/money/agriculture/2015/04/20/avian-flu-chicken-eggs/26094811/
Where it stands: The avian flu outbreak and Minnesota turkeys
http://www.mprnews.org/story/2015/04/08/avian-flu-running-tally
In broilers, the signs of disease are frequently less obvious with severe depression, inappetence, and a marked increase in mortality being the first abnormalities observed. Oedema of the face and neck and neurological signs such as torticollis and ataxia may also be seen. The disease in turkeys is similar to that seen in layers, but it lasts 2 or 3 days longer and is occasionally accompanied by swollen sinuses. In domestic ducks and geese the signs of depression, inappetence, and diarrhea are similar to those in layers, though frequently with swollen sinuses. Younger birds may exhibit neurological signs.
Government scientists theorize that when ducks and other migratory waterfowl from different flyways gather at their northern breeding grounds this summer, they could expose each other to the highly pathogenic H5N2 virus, then carry it back south this fall along several migration routes, perhaps including the Atlantic Flyway. That flyway includes several of the country's top poultry producing states including Georgia, the Carolinas, Virginia, Delaware and Maryland.
Bird Flu Outbreak Could Head Eastward With Fall Migration
http://abcnews.go.com/Technology/wireStory/bird-flu-outbreak-head-eastward-fall-migration-30346589
5.3 million Iowa laying hens to be destroyed in bird flu outbreak
http://www.desmoinesregister.com/story/money/agriculture/2015/04/20/avian-flu-chicken-eggs/26094811/
Where it stands: The avian flu outbreak and Minnesota turkeys
http://www.mprnews.org/story/2015/04/08/avian-flu-running-tally