Newcastle disease symptoms


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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

Newcastle Disease sings
comb became starting to bluish color in live struggling birds, please see the close upper part of comb in Newcastle disease

The comb may become blue as the bird becomes cyanotic in Newcastle disease. but hemorrhages are only seen with some isolates.

Newcastle Disease sings
The comb has been partly bluish in color due to a lack of oxygen in the blood in Newcastle disease infection. the has been collected after death by the Newcastle disease virus


Both eyelids are swollen preventing them from fully opening. in some cases, eyelids are crusted with a small amount of yellow material.

Newcastle Disease sings
Lower eyelid became redden in color in Newcastle disease

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.

Newcastle Disease sings
green bile pigment in feces

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.

Newcastle Disease sings
Characteristics green color faces in Newcastle disease

Additionally, diuresis results in an excessive amount of white urates seen in these feces in Newcastle disease.


Mesogenic strains of Newcastle disease usually result in low or no mortality in 4-week-old chickens and will present with neurological signs such as torticollis, and paralysis.

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.

In viscerotropic NDV, Edema of the eyelids typically produces an “almond-shaped” appearance to the eyes. Mild edema of the face and neck which is one of the early signs of the neurotropic form.

7. Nasal cavity

Accumulation of mucus in the nasal cavity which is seen after pressing the nose.

Newcastle Disease sings

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.

Newcastle Disease sings
Excessive egg breakage, misshape, discolor eggs in Newcastle disease

Eggs turn to white color in Newcastle disease affected farm

The percentage decrease in egg production depends on the strain of NDV. At 1 month after infection, misshapen and corrugated size.

Newcastle disease always associated with Coccidiosis in broiler and layer hen. the medication of anticoccidial drugs runs with other drugs in Newcastle disease.

See Also- The best drugs for coccidiosis in poultry

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newcastle disease vaccine with its advantages & disadvantages


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

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