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Did you introduce a new bird/birds?
Yeah, I bought some birds from a guy who told me his birds were vet checked and healthy. They were fine for a little while, and then the other chickens started getting sick. Turned out his birds were carriers of Coryza and Avian Leukosis! (I had a necropsy done.)
You're in such a difficult position. I would have definitely rescued a hen by the side of the road too, and of course you wouldn't want to cull her if she recovers...hmm...the only thing I can think of to do is to isolate her for 30 days, and then if she's healthy put her in with another chicken or two and isolate them for awhile and see if anything happens. If they are all fine after so many days, then I would probably risk it and introduce them back to the flock with the new bird. But that seems like so much effort...I don't know.