Over the last several weeks, I have been losing pullets like crazy. First it was just my BC Marans, 5 of them, then a buff orphington and 3 light brahmas and now today a silkie.. They have all showed the same signs.. First, they were just a little off..then they wouldnt walk around like the rest.. then it looked like they hurt a leg.. then they wobbled and could not stand...If I put food and water in front of them they would drink.. but they never got better..All but the silkie died on there own.. I had the silkie put down by my neighbor today.. From the research I did, I am almost positive it is merecks disease.. None of them were vaccinated for it. The BC marans were hatched here (very expensive eggs, by the way) and the others I got from Ideal poultry.. I didnt get them there merecks vaccine because of other research I did not recommending it..Im trying to look up that info again... but, live and learn.. The pullets were all hatched the end of June and early July.. They are in with about 13 adult chickens and 5 call ducks now. ( My 2 other silkies are in a seperate pen... and they hate it..)Before they were big enough to be in with the bigger chickens, they were in a pen right next to them and some of the older hens would fly into there pen and eat there food.. What do I need to do to safeguard my other chickens? So far everyone looks good... If I notice any signs from any more, Im going to immediatly seperate her and keep a watch for a couple days before I cull her... This is my first time raising chickens and im pretty attached to them.. They all have names.. and attitudes.. Thanks for any help and thanks for reading my extremely long winded letter..