A herpesvirus that causes paralysis (classic split leg posture), tumors, and a gray eye. No cure. Survivors stay lifetime carriers. Vaccinate chicks at hatch to prevent it.
AI illustration of Marek's Disease
Mix of AI illustrations and anonymized real cases shared by community keepers. Visual severity varies by bird, age, and stage.
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There is no cure. Affected birds should be isolated and humanely culled in most cases. Supportive care can extend life for pet birds but the disease progresses.
Prevention
Vaccinate day old chicks at the hatchery. Buy only vaccinated stock. Strict biosecurity, the virus survives in coop dust for months. Quarantine new birds 30 days minimum.
