Marek's disease: A viral disease that affects poultry - it is very contagious and is a herpes virus. The virus tends to affect the nerves and cause tumors in internal organs. Poultry may be unable to lay eggs or may even die. Young birds are more susceptible than older birds with death most common between the ages of 8 and 20 weeks. The virus may attack the nervous system and result in paralysis or it may attack the visceral system and cause tumors in the internal organs. Some birds may die without any obvious symptoms. More detailed information about the symptoms, causes, and treatments of Marek's disease is available below.
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Prognosis for Marek's disease: Most cases end in death. It's highly contagious nature may be devastating in commercial operations. Birds may become infected and not develop symptoms but may be carriers of the virus for months - the virus can spread from these birds to unvaccinated birds.
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Marek's disease is listed as a "rare disease" by the Office of
Rare Diseases (ORD) of the National Institutes of Health
(NIH). This means that Marek's disease, or a subtype of Marek's disease,
affects less than 200,000 people in the US population.
Source - National Institutes of Health (NIH)
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