Marek's disease primarily manifests through a range of neurological and general clinical signs, often leading to severe health deterioration and mortality in affected birds.
Key Symptoms of Marek's Disease
The symptoms of Marek's disease, particularly its neural form, are quite distinctive and can progress over time. These include:
- Progressive Paralysis: This is a hallmark symptom, most commonly affecting the legs. An affected bird might exhibit a characteristic posture where one leg is extended forward, and the other is tucked under the body. This paralysis impairs the bird's mobility significantly.
- Weight Loss: Birds suffering from Marek's disease often experience noticeable weight loss.
- Labored Breathing: Respiratory difficulties, characterized by strained or difficult breathing, can be observed.
- Diarrhea: Digestive issues, including the presence of diarrhea, are another common symptom.
- Starvation and Death: Due to the progressive paralysis and other debilitating symptoms, birds may become unable to reach essential resources like feed and water, leading to starvation. Furthermore, their weakened state makes them vulnerable to trampling by other birds in the flock, often resulting in death.
These symptoms collectively point to a severe impact on the bird's nervous system and overall bodily functions.
