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And then they're carriers so they can infect others.
Every chicken there has already been exposed and is a carrier already. So unless you cull them all it doesn't matter. This is why vaccination is so helpful.
Actually the chickens there that were exposed & did not become ill are...
It could also be Mareck's & if so she should be isolated & culled.
As to having a vet come out-around here they charge $50 to $100 for showing up. I guess you'd have to decide how much this chicken is worth to you. Of course the other problem is most large animal vets know almost nothing about...