I want to try to figure out how to post a video for you bcuz I think then you'll be able to definitavely tell me whether or not it's MD. I grew up on a chicken farm from age 5 on all through the teen years and beyond and I've never seen anything like this...and I've asked my father if he's ever seen a chicken with Mareks and he said no. I'm guessing being a commercial farm they were vaccinated.
No, in answer to your question I didnt have them vaccinated.

I didnt think I needed to, never thinking of how they might possibly be infected through wild birds...we do have alot of chickens in our neighborhood as we all have acreages.
Also wanted to mention that when I found my hen had died she had 1 leg forward 1 back.

I have taken in two new chickens but it was after Gracie had passed away. I have 6 baby chicks that are two weeks old and they are in the henhouse, but penned off from the others. Is it too late to vaccinate them? Their mother, I'm sure was exposed to Stuey before she hatched the babies.
I sure wish I knew what to do about Stuey. You know how attached you get to them when they are dependent on you....when I take him out of his crate he just gets sooo happy. He's not mobile at all....he doesnt however flop over on his side anymore when he first came down with whatever it is. But on the other hand he doesnt have the strength to even partially hold himself up If it IS Mareks I wonder how many I'm going to lose. They are all pets and have names.

I never in a million years would have guessed my chickens would ever have something like this in the flock. Any chicks that come in from a hatchery now will be vaccinated. I do have some that I got from a hatchery a year ago in February and 1 of those passed away just a couple months ago...she wasnt well for quite some time but she didnt show any of the mareks signs...she just was listless and puffed up...
Well, it's almost chore time so I will get a video of Stuey when I take him out of the crate and see if I can post it on here for you to see exactly what he does. Gotta love technology...without it we wouldnt be having this conversation. Thank You for helping me.