In August I got two easter egger pullets, one white and one orange, seemingly from two different clutches. The birds were shipped overnight from California, and I was assured they were both vaccinated for Marek's disease; I had even tried to add on a vaccination package, but I was assured that as started pullets, they had both been vaccinated by default when they were chicks. 3 weeks ago the orange one began showing signs of paralysis, and eventually became completely unable to stand and had to be brought inside and isolated. I took her to the vet after I found swelling on one of her hock joints, and was sent home with loxicom and clindamycin. The vet confirmed that, while she did have a leg injury, both of her legs were responsive to stimulus (she pinched the skin on her toes and Nutmeg reacted to it). The vet did not seem to think the culprit was Mareks when I mentioned my suspicions; she's still unable to walk, but is getting stronger and using her legs to climb up on my legs when I take her out to feed and medicate her. Well, as of today the second pullet, Meringue, is showing serious balance issues and struggling to walk. She's bright eyed and eating, but she can't walk very far without sitting down. Her wings both work, and she's even able to fly a short distance when I open her pen. She's on straw bedding, about 13 weeks old and eating dumor starter/grower. She's not in physical contact with my other 2 year old wyandotte, or any other chicken since Nutmeg was brought inside. My question is, is it possible that the vaccine totally failed two out of two times? Or could it be something else wrong with them both?