Poultry Disease

Tag: Marek's Disease

Marek’s disease (MD) is a neoplastic disease of chickens caused by the ubiquitous MD virus (MDV), a lymphotropic alphaherpesvirus. MD is typified by a plethora of clinical signs, e.g: neural symptoms, chronic wasting and the pathognomonic development of multiple lymphomas (that manifest as solid tumors in the viscera and musculature). Prevention is achieved by MD vaccines – cell-associated virus or cell-free HVT – administered in ovo (18th embryonic day) or upon hatching.


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