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I don’t know. However, it is true that Marek’s can remain in the soil for years, if it is Marek’s.

Then I highly doubt they had Marek’s. Chicks from large hatcheries like Meyer are completely isolated from other birds except for the other ones they hatch with. The Marek’s vaccine does not give chickens Marek’s, but it also doesn’t prevent them from later getting the disease and spreading it...

Definitely do NOT rehome chickens who may have Marek’s. If they did introduce Marek’s into your flock all your birds are already carriers. How old were the chicks when you bought them? Were they from a hatchery or a private breeder?

That’s true, I just wanted to clarify for anyone reading your post.

Vaccinated chickens can only transmit the disease if they get it first. The vaccine does not give them Marek’s. Just something to keep in mind.