Unless vitamin deficiency is contagious I don’t think it’s that.
I took my chicken, ghost to the vet, they said it was most likely Mareks as they’ve had many other cases of Mareks that year.
The “cure” is more of a way to keep them alive and speed up the process of the virus so it passes before they die, we found a post on it about how someone saved their entire flock with that treatment, and it is most definitely working, even if it is not Mareks Reaper is almost fully recovered her leg is just still hard to move, she’s getting there though, been wobbling around her cage.
Homeopathy is never a “cure” it’s just making it pass much faster then usual, it’s not like a drug medicine that just suppresses symptoms, it helps her system work the virus out faster while I keep her fed and watered even if she doesn’t want to. I’m really glad it is working for me, the medicine Hypericum helps heal nerve injury then I think the apple cider vinegar is to help kill off anything in her stomach preventing her from eating or pooping