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But can ocular Mareks show up spontaneously in a 17 month old hen that was vaccinated and shows no other signs of Mareks (paralysis, lethargy, etc....)? From my understanding, that would be rare because it is primarily a virus that affects young chicks up to 20 weeks of age.

Thanks for the suggestion. I'm not sure what to think. This hen is about 17 months old. She was a McMurray Hatchery order and vaccinated prior to arrival. I know that isn't foolproof but if she caught Mareks at a younger age, wouldn't it have become evident before now? She is eating and drinking...

I'm so sorry that you lost her.... :hugs

Did you ever get a picture of the eye going blind? I managed to catch my girl in the nesting box this morning. Here's a picture of her eye. I couldn't get her to turn her head without freaking her out so I can't show a comparison but Black Australorp eyes don't look like this. They are...

Yesterday morning I was feeding and noticed one of my Black Australorps sitting in a nesting box. She caught my eye because HER eye looked funny. Instead of being solid black where you can't really distinguish the pupil from the iris, hers almost looked reptilian. I wish I'd had my camera to...