I have a sick silkie chick and I'm hoping someone can help me determine the best treatment. I purchased 6 black silkie's from a small time breeder 3 weeks ago. They were ages 5 weeks, 4 weeks, 2 weeks, and 3 just hatched. The first one died while still with her, and she said in got caught in the bars overnight(just hatched chick). The second one died at a week old, and we noticed a small amount of bloody stool, so I began treating with Corid(again one of the youngest). Now my 16 yr old daughter, who cares for the chicks misunderstood me( I told her to treat for 3 days) and they have been on the Corid for 10 days. Yesterday the last of the young chicks seemed to loose control of it's legs. This morning it seems paralized all over. Upon questioning my daughter, I realized that she still had them on the Corid so we've removed that and added Rooster Booster to the water. What else can I do to help this little one. I'm also scared that this may be Mareks and could infect my flock of layers. We had already decided to keep these silkies in coop at the other side of our property. But our layers got out yesterday and were scratching around in the litter we had just cleaned out of the brooder. Shoudl I be concerned about Mareks?