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https://extension.psu.edu/mareks-disease-in-chickens

With Mareks it is best to cull or isolate the flock and do not sell or add any more to your flock until all poultry is gone.

https://vetmedbiosci.colostate.edu/vdl/colorado-avian-health-program/mareks-disease/ https://www.backyardchickens.com/articles/the-great-big-giant-mareks-disease-faq.66077/