Thanks so much Jack! I do think it is neurological, but apparently Mareks can present itself neurologically or viscerally (prone to tumors) or something like that, if I recall correctly. Perhaps your chickens responded viscerally?
As for your hen, how did the vet discover the break? There doesn't seem to be any pain when I palpate Blondie's back or her legs, and my vet examined her pretty well manually as well.... if something was broken, I would think my gal would exhibit some pain...
Unfortunately, the Vet said the way her eye looked was conclusive....yet to my untrained eye, the iris is just a *little* lighter than the other, and a little slower to respond to light, but it does, and it is perfectly round. It does puzzle me that she's lasted this long...
I almost went today to one of the few vets locally that treats chickens, but he tends to throw antibiotics at everything... I've emailed my vet (45 min away) who is an avian specialist and will see what she thinks... maybe Blondie will be one of the few that survives but then comes down with it later... it's just hard to know what to do and how to help her... and work FT!