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I have a hen who is about 3 years old.  She started walking very spread-legged, like a duck, a few days ago.  Her poop looks like a hard-boiled egg yolk, and her breathing is labored.  After an intensive inspection, she appears to have mites.  Another hen died of these same symptoms about 3 months ago, but I didn't notice mites then.  


I am guessing, based on the symptoms, that she may have Mareks.  I have separated her from the others and when I was carrying her, she had what looked like a seizure, eyes rolled back in her head, neck flexing and flailing, wings flapping.  She calmed down and 2 hours later, is still living, but her breathing continues to be very labored.


1.  Do you think it is Mareks?

2.  What can I do about the rest of the flock, obviously already exposed?

3.  I have 5 week old chicks in a separate area with a broody mom.

4.  Is she suffering and does she need to be put down? (not that I could do it, but ...)


Thanks to all who read, ponder, and offer thoughts.