Sorry for the short post last night. Was checking my messages before bed on my phone (I'm way too addicted to chickens) and saw this.
How is she doing today?
If she were mine, I'd give her vitamin supplements at this point. I will say that I do not know of the interactions of vitamin D in the uptake of these other vitamins-- you may want to call your vet and ask. However, it's important to know that some vitamin deficiencies CAN cause leg paralysis/weakness. Look at it this way... if it's Marek's, there is little you can do beyond supportive care. So may as well see if vitamins help her, right?
Here's a post I made in another thread, in case it helps: https://www.backyardchickens.com/t/...e-wing-very-unbalanced-stiff/10#post_11756621
After some discussion with another user on yet another thread (which I can't find at the moment), it was suggested that B-complex (especially B12) might be AS important as vitamin E.
I hope this is of some help!
How is she doing today?
If she were mine, I'd give her vitamin supplements at this point. I will say that I do not know of the interactions of vitamin D in the uptake of these other vitamins-- you may want to call your vet and ask. However, it's important to know that some vitamin deficiencies CAN cause leg paralysis/weakness. Look at it this way... if it's Marek's, there is little you can do beyond supportive care. So may as well see if vitamins help her, right?
Here's a post I made in another thread, in case it helps: https://www.backyardchickens.com/t/...e-wing-very-unbalanced-stiff/10#post_11756621
Okay! Take a deep breath.
The photo and the symptoms you are describing do sound like Marek's, but it CAN be other things. The fact that she's been exposed to other birds, especially at a fair, is obviously a big disease vector, since Marek's travels on chicken dander-- which is everywhere at a show/fair. The best thing to do is to keep biosecurity at this point in case it is Marek's, but explore other possibilities.
The one good thing is that she's been like this for two weeks you say? With the leg paralysis? That suggests it might not be Marek's, because usually once they develop paralysis they have tumors and (sadly) they don't last long after that. It tends to be an aggressive lymphoma.
What is her diet like? Sometimes vitamin deficiencies can manifest as paralysis or weak limbs. It may be worth exploring Vitamin E (most importantly considering her symptoms) and Vitamin B complex (that contains B12) vitamin supplements. Selenium when used in conjunction is generally thought to be beneficial for uptake/absorption. Here's some reading: http://www.merckmanuals.com/vet/pou..._poultry/vitamin_deficiencies_in_poultry.html
This page describes the symptoms you have mentioned, and has some dosing information at the end for Vitamin E... http://www.poultrynews.com/New/Diseases/Merks/207020.htm
More dosage: https://www.backyardchickens.com/t/380235/vitamin-e-dosage#post_4600002
As vitamin E is fat soluble, please be sure not to overdose as they can end up causing other problems if they build up too much in the hens' body.
After some discussion with another user on yet another thread (which I can't find at the moment), it was suggested that B-complex (especially B12) might be AS important as vitamin E.
I hope this is of some help!