OK. Not a lesson learned but a reinforcement of what I already knew. If your chickens get sick but don't have any real discernible symptoms to lead you to a real diagnosis, don't start worming and feeding antibiotics.
I thought I had a few chickens that had a bad case of worms. Rather than start worming them, I had a fecal sample read. They had no worms but a bacterial disease that tetracycline cured.
This time, rather than worm or pumping antibiotics, I gave up a sacrificial bird that I had planned on culling anyway. I got a call from the doctor just now. He said it was wasting away and had a lot of trapped fluid. Preliminary diagnosis is carcinomatosis. They still have some microscopic work to do for the final report but the bird had cancer. Any guesswork treatment wouldn't have done anything and prolonged her suffering.
Total cost for lab work is about $55. Well worth the cost to know exactly what was wrong.
I asked about possible causes like environmental, nutritional, etc.. He said there's no way of knowing and that those are possibilities but some in depth study done in Israel pointed to a retro-virus as being one possible initial cause.
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Shame about the chicken, but it brings some comfort to know you did the right thing, and it's nice to not have to worry about what caused it.
*Edit*And thanks