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It's not in the soil unless a chicken put it there.
It's hard to say because Marek's can show up soon or later, in one chicken but not another.
I put together a history, that showed me why 7 chickens died in the last 2 years. And the only chicken that didn't hatch here was a silkie pullet, and there were no deaths before her. I never put 2+2 together til my silkies hatched these Polish.
My guess. If the pullet hatched at your home, someone before her brought it in. Who was the last chicken brought into your flock alive? If it wasn't the last live chicken introduced, I might say that someone already in your flock would have shown symptoms before the Dec. chick.
I think the only thing now is to know your flock carries it. You may lose one or so of them sporadically. Any new addition needs to be vaccinated at a day old, or they may die.
Can't think of anymore right now.
Thanks! I had assumed in the soil because years ago my farm was a chicken farm and the people that lived here before me had chickens. But I would think it would have showed up before December also. So the last new ones were in November and safe to assume possibly from them.