I agree. Often, as tumors shift/grow, paralysis can change. But, like cancer, sometimes just the right nutritional supplements/environmental conditions can trigger remission.
You are a good chicken keeper - and the thing I've found about having any flock issues is that those issues tend to just make a person better and better at caring for their feathered friends. I would tell you "Don't worry, most people lose more birds to predators than to Marek's", but you will...
With your roo, did they look for visceral tumors or run cultures to look for MDV? Like I mentioned earlier, it can weaken the immune system so the bird succumbs to some other infection.
The antibiotics might interfere with vitamin absorption (although I'm not positive about Tylan). I use the fast acting, horrible smelling Nutri drench as my go-to vitamin. Sometimes you can help them go into a bit of a "remission" for a while. Marek's is basically, when all is said and done...
Hello!
Sorry your girl is unwell!
So, let me tell you why I think it could be Marek's (which is a lot more common than people think...or want to admit) and why it might not be.
1. Most chickens that have Marek's don't present classic Marek's symptoms. ..they die from a secondary infection...