Now I see what you guys say about not introducing new birds to an established flock. I introduced a young sultan/silkie to my flock about 4 weeks ago and now he is showing signs of Mareks disease. He has the characteristic splayed leg and wings tonight. He was in the sick hospital as before it looked like he walked on the backs of his legs. I think I am going to cull him as it is indicated that if he recovers he will be a carrier. Is it possible that one of the chickens in my flock is a carrier and the rest of the flock has already been exposed to it as no one else seems ill? Also I will have some chicks hatching on Easter. Should I vaccinate them since this has occurred on my farm? If so where can I get the vaccine?