NEWCASTLE DISEASE SYMPTOMS
Newcastle disease symptoms depend on factors that influence the incubation period. It also accounts for the variation in the clinical signs observed after infection. Clinical symptoms of Newcastle disease in other poultry species can be different and depend not only on the species but also on the specific breed of bird.
1. Blue Comb
Both eyelids are swollen preventing them from fully opening. in some cases, eyelids are crusted with a small amount of yellow material.
The ocular conjunctiva is visible along the lateral canthus of the eye and a congested blood vessel is evident. The conjunctiva has been reflected back to show that the mucosa is swollen, dark red and wet.
4. Green Color Feces
A close-range view of the feces shows both the green bile pigment as well as the white urates. These diarrheal feces is somewhat characteristic of Newcastle disease.
A large amount of watery diarrhea is a common finding in Newcastle disease. This diarrhea often has a greenish color due to the presence of bile.
6. Facial edema
Bilateral facial edema of the face is produced a square-shaped face. It is often the best appreciating from this vantage point in viscerotropic velogenic Newcastle disease. In the severe cold season, There is bilateral swelling of the face which gave the head a “square” contour.
7. Nasal cavity
Accumulation of mucus in the nasal cavity which is seen after pressing the nose.
Other symptoms are Respiratory symptoms, including mucus in the respiratory tract, which can be associated with both low virulence and high virulence NDV.
8. Egg abnormalities
Well-vaccinated layers infected with Viseratropic Newcastle disease (vNDV) may only present with a decrease in egg production 1 week after infection, with the fewest eggs produced 2 to 3 weeks post-infection, after which the number of eggs produced will start to increase.
The percentage decrease in egg production depends on the strain of NDV. At 1 month after infection, misshapen and
Diseases of Poultry, 13th Edition Editor-in-Chief David E. Swayne Laboratory Director Southeast Poultry Research Laboratory Agricultural Research Service U.S. Department of Agriculture Athens, Georgia United States